Interstitial lung disease: Difference between revisions

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{{DiseaseDisorder infobox |
{{Interstitial lung disease}}
  Name          = {{PAGENAME}} |
  Image          = honeycomb.jpg |
  Caption        = End-stage pulmonary fibrosis of unknown origin, taken from an autopsy |
}}


'''For the WikiPatient page for this topic, click [[Interstitial lung disease (patient information)|here]]'''
'''For the WikiPatient page for this topic, click [[Interstitial lung disease (patient information)|here]]'''
{{Interstitial lung disease}}


{{CMG}}
{{CMG}}; {{AE}} {{SSH}}, {{Anmol}}, Saarah T. Alkhairy, M.D.


{{SK}} Diffuse parenchymal lung disease; DPLD; ILD
{{SK}} Diffuse parenchymal lung disease; DPLD; ILD


==[[Interstitial lung disease overview|Overview]]==
==Overview==
Interstitial lung disease is a group of disorders involving pulmonary [[parenchyma]]. The exact pathogenesis of these disorders is not completely understood. There are multiple initiating factors that may lead to [[pulmonary]] injury. However, immunopathogenic responses of [[lung]] tissue are quite similar. The major histopathologic patterns in response to [[lung]] injury include [[inflammation]], [[fibrosis]] and [[Granuloma|granulomatous]] response. Interstitial lung disease may be classified into several subtypes based on the lung response to [[tissue]] injury and the cause of injury. The underlying cause of interstitial lung disease may include factors such as toxic [[Environmental Health Perspectives|environmental]] or [[Occupational Health|occupational]] exposure, [[Smoking|cigarette smoking]], and [[Radiation therapy|radiation]]. Interstitial lung disease may also be idiopathic.
 
==Classification==
Interstitial lung disease may be classified on the basis of lung response to [[tissue]] injury. The lung response to tissue injury may be characterized as:<ref>{{cite book | last = Kasper | first = Dennis | title = Harrison's principles of internal medicine | chapter =315: Interstitial Lung Diseases | editor1-last=Talmadge |editor1-first= E. King, Jr. | publisher = McGraw Hill Education | location = New York | year = 2015 | isbn = 0071802150 }}</ref>
*[[Granulomatous]]
*[[Alveolitis]], interstitial [[inflammation]], and [[fibrosis]]
<div style="width: 80%">
<small>
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{{Family tree| | | | | | | | | | | | | | | A01 | | | | | | | | | | | | A01=Interstitial lung disease}}
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{{Family tree| | | | | | | | | | B01 | | | | | | | | | | | | B02 | | | | | |B01=Lung Response:<br>[[Granulomatous]]|B02=Lung Response:<br>[[Alveolitis]],<br>Interstitial [[Inflammation]],<br>and [[Fibrosis]] }}
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{{Family tree| | | | | | C01 | | | | | | C02 | | | | | | | | |!| | | | | | | | | | | |C01=Known|C02=Idiopathic (Unknown)}}
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{{Family tree| | D01 | | D02 | | D03 | | D04 | | D05 | | D06 |!| | | | | | | | | | |D02=Inorganic dusts|D01=[[Hypersensitivity pneumonitis]] (organic dusts)|D03=[[Sarcoidosis]]||D04=[[Lymphomatoid granulomatosis]]|D05=Granulomatous vasculitides|D06=[[Bronchocentric granulomatosis]]}}
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{{Family tree| | | | E01 | | E02 | | | | | | D07 | | D08 | | |!| | | | | | | | | | |E01=[[Occupational lung disease|Beryllium]]|E02=[[Occupational lung disease|Silica]]|D07=Eosinophilic granulomatosis with polyangiitis ([[Churg - Strauss Syndrome|Churg Strauss syndrome]])|D08=[[Granulomatosis with polyangiitis|Granulomatosis with polyangiitis]] ([[Granulomatosis with polyangiitis|Wegener's]])}}
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{{Family tree| | | | | | | | | | | | | | F01 | | | | | | | | F02 | | | | | | | | | | | | | | F01=Known cause|F02=Idiopathic (Unknown)}}
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{{Family tree| G01 | | G06 | | G02 | | G03 | | G04 | | G05 | |!| | | | | | | | | | | | | | | | | | | G01=Drug-induced pulmonary toxicity|G06=Occupational and environmental exposure|G02=[[Interstitial lung disease#Radiation-induced lung injury|Radiation-induced lung injury]]|G03=[[Aspiration pneumonia]]|G05=Residual of [[acute respiratory distress syndrome]]|G04=Smoking-related}}
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{{Family tree| I01 | | I02 | | I03 | | G07 | | G08 | | G09 | |!| | | | | | | | | | | | | | | | | | |I01=Inhaled inorganic dust|I02=Inhaled organic dusts|I03=Inhaled agents other than inorganic or organic dusts|G07=Desquamative interstitial pneumonia|G08=Respiratory bronchiolitis–associated interstitial lung disease|G09=Pulmonary Langerhans cell granulomatosis|}}
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{{Family tree| H01 | | H07 | | H02 | | H08 | | H10 | | H09 | | H11 | | H06 | | H03 | | H04 | | H05 |H07=Idiopathic [[interstitial pneumonias]]|H01=[[Pulmonary alveolar proteinosis]]|H02=Lymphocytic infiltrative disorders<br>(lymphocytic [[interstitial pneumonitis]]<br>associated with connective tissue disease)|H08=Connective tissue<br>diseases|H03=[[Eosinophilic pneumonia|Eosinophilic<br>pneumonias]]|H09=Inherited diseases|H04=[[Lymphangioleiomyomatosis]]|H10=Gastrointestinal or<br>liver diseases|H05=[[Amyloidosis]]|H11=Graft-versus-host disease|H06=Pulmonary hemorrhage syndromes}}
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{{Family tree| I04 | | I05 | | I06 | | |!| | | |!| | | |!| | | |!| | | |!| | | | | | | | | | |I04=Major idiopathic [[interstitial pneumonias]]|I05=Rare idiopathic [[interstitial pneumonias]]|I06=Unclassifiable idiopathic interstitial pneumonias}}
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{{Family tree|boxstyle=text-align: left; | J01 | | J02 | | | | | | J07 | | J09 | | J08 | | J10 | | J11 | | | | | | | | |J01=• Idiopathic pulmonary fibrosis<br>• Idiopathic nonspecific interstitial pneumonia<br>• Respiratory bronchiolitis-interstitial lung disease<br>• Desquamative [[interstitial pneumonia]]<br>• [[Cryptogenic organising pneumonia]]<br>• Acute interstitial pneumonia<br>|J02=• Idiopathic lymphoid interstitial pneumonia<br>• Idiopathic pleuroparenchymal fibroelastosis<br>|J07=• [[Systemic lupus erythematosus]]<br>• [[Rheumatoid arthritis]]<br>• [[Ankylosing spondylitis]]<br>• [[Systemic sclerosis]]<br>• [[Sjögren syndrome]]<br>• [[Polymyositis]]<br>• [[Dermatomyositis]]<br>|J08=• [[Tuberous sclerosis]]<br>• [[Neurofibromatosis]]<br>• [[Niemann-Pick disease]]<br>• [[Gaucher disease]]<br>• Hermansky-Pudlak syndrome<br>|J09=• [[Crohn disease]]<br>• [[Primary biliary cirrhosis]]<br>• Chronic active [[hepatitis]]<br>• [[Ulcerative colitis]]<br>|J10=• [[Bone marrow transplantation]]<br>• Solid organ transplantation<br>|J11=• [[Goodpasture syndrome]]<br>• Idiopathic pulmonary hemosiderosis<br>• Isolated pulmonary capillaritis
|}}
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</small>
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==Pathophysiology==
*Interstitial lung disease is a group of disorders affecting pulmonary [[parenchyma]].
*The exact pathogenesis of these disorders is not completely understood.
*There are multiple initiating factors that may cause [[pulmonary]] injury. However, immunopathogenic responses of [[lung]] tissue are quite similar.
*There are two major histopathologic patterns in response to [[lung]] injury which include:
**[[Inflammation]] and [[fibrosis]] pattern
**[[Granulomatous]] pattern
<br>
<div style="text-align: center;">'''Algorithm showing pathophysiology of Interstitial Lung Disease'''<ref name="pmid25726561">{{cite journal| author=Bagnato G, Harari S| title=Cellular interactions in the pathogenesis of interstitial lung diseases. | journal=Eur Respir Rev | year= 2015 | volume= 24 | issue= 135 | pages= 102-14 | pmid=25726561 | doi=10.1183/09059180.00003214 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=25726561  }} </ref></div>
 
 
{{Family tree/start}}
{{Family tree| | | | | | | | | | | | | | | | | | | | | | | T01 | | | | | | | | | | | | T01=[[Tissue]] injury in [[lungs]]}}
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{{Family tree| | | | | | | | | | | | | | | | | S01 | | | | | | | | | | S02 | | | | | | | S01=[[Parenchymal]] injury|S02=[[Vascular]] injury}}
{{Family tree| | | | | | | | | | | | | | | | | |!| | | | | | | | | | | |!| | | | | | | | }}
{{Family tree| | | | | | | | R01 | | | | | | | |!| | | | | | | | | | | R02 | | | | | | | R01=[[Mast cell]]s in [[lungs]] in response to tissue injury|R02= LPA6, LPA2, and LPA4 receptors<ref name="pmid23084965">{{cite journal| author=Ren Y, Guo L, Tang X, Apparsundaram S, Kitson C, Deguzman J et al.| title=Comparing the differential effects of LPA on the barrier function of human pulmonary endothelial cells. | journal=Microvasc Res | year= 2013 | volume= 85 | issue=  | pages= 59-67 | pmid=23084965 | doi=10.1016/j.mvr.2012.10.004 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23084965  }} </ref>}}
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{{Family tree| | Q01 | | Q06 | | Q03 | | | | | Q02 | | | | | | | | Q04 | | Q05 | | | | | Q01=Decreased [[Secreted frizzled-related protein 1|sFRP-1 (secreted frizzled-related protein 1)]] in [[fibroblasts]]<ref name="pmid21360508">{{cite journal| author=Hsu E, Shi H, Jordan RM, Lyons-Weiler J, Pilewski JM, Feghali-Bostwick CA| title=Lung tissues in patients with systemic sclerosis have gene expression patterns unique to pulmonary fibrosis and pulmonary hypertension. | journal=Arthritis Rheum | year= 2011 | volume= 63 | issue= 3 | pages= 783-94 | pmid=21360508 | doi=10.1002/art.30159 | pmc=3139818 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21360508  }} </ref>|Q02= [[Insulin-like growth factor]] ([[IGF]]) signalling<ref name="pmid21360508">{{cite journal| author=Hsu E, Shi H, Jordan RM, Lyons-Weiler J, Pilewski JM, Feghali-Bostwick CA| title=Lung tissues in patients with systemic sclerosis have gene expression patterns unique to pulmonary fibrosis and pulmonary hypertension. | journal=Arthritis Rheum | year= 2011 | volume= 63 | issue= 3 | pages= 783-94 | pmid=21360508 | doi=10.1002/art.30159 | pmc=3139818 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21360508  }} </ref>|Q03=[[Transforming growth factor-β]] ([[TGF-β]])<ref name="pmid19926870">{{cite journal| author=Andersson CK, Mori M, Bjermer L, Löfdahl CG, Erjefält JS| title=Alterations in lung mast cell populations in patients with chronic obstructive pulmonary disease. | journal=Am J Respir Crit Care Med | year= 2010 | volume= 181 | issue= 3 | pages= 206-17 | pmid=19926870 | doi=10.1164/rccm.200906-0932OC | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19926870  }} </ref>|Q04= Reduced expression of angiogenic factors,<br>[[vascular endothelial growth factor]] (VEGF)<ref name="pmid14754760">{{cite journal| author=Ebina M, Shimizukawa M, Shibata N, Kimura Y, Suzuki T, Endo M et al.| title=Heterogeneous increase in CD34-positive alveolar capillaries in idiopathic pulmonary fibrosis. | journal=Am J Respir Crit Care Med | year= 2004 | volume= 169 | issue= 11 | pages= 1203-8 | pmid=14754760 | doi=10.1164/rccm.200308-1111OC | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=14754760  }} </ref>|Q05=Elevation of angiostatic factors,<br>pigment epithelium-derived factor<ref name="pmid15117744">{{cite journal| author=Cosgrove GP, Brown KK, Schiemann WP, Serls AE, Parr JE, Geraci MW et al.| title=Pigment epithelium-derived factor in idiopathic pulmonary fibrosis: a role in aberrant angiogenesis. | journal=Am J Respir Crit Care Med | year= 2004 | volume= 170 | issue= 3 | pages= 242-51 | pmid=15117744 | doi=10.1164/rccm.200308-1151OC | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15117744  }} </ref>|Q06=Secretes [[tryptase]]}}
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{{Family tree| | P01 | | P02 | | P05 | | P04 | | | | P03 |.| | | | | | P06 | | | | | P01=[[Wnt signaling pathway|Wnt/β-catenin signalling pathway]]<ref name="pmid18478089">{{cite journal| author=Königshoff M, Balsara N, Pfaff EM, Kramer M, Chrobak I, Seeger W et al.| title=Functional Wnt signaling is increased in idiopathic pulmonary fibrosis. | journal=PLoS One | year= 2008 | volume= 3 | issue= 5 | pages= e2142 | pmid=18478089 | doi=10.1371/journal.pone.0002142 | pmc=2374879 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=18478089  }} </ref><ref name="pmid21454805">{{cite journal| author=Lam AP, Flozak AS, Russell S, Wei J, Jain M, Mutlu GM et al.| title=Nuclear β-catenin is increased in systemic sclerosis pulmonary fibrosis and promotes lung fibroblast migration and proliferation. | journal=Am J Respir Cell Mol Biol | year= 2011 | volume= 45 | issue= 5 | pages= 915-22 | pmid=21454805 | doi=10.1165/rcmb.2010-0113OC | pmc=3262680 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21454805  }} </ref>|P02=PAR-2/protein kinase (PK)C-α/Raf-1/p44/42 signaling pathway<ref name="pmid23562441">{{cite journal| author=Wygrecka M, Dahal BK, Kosanovic D, Petersen F, Taborski B, von Gerlach S et al.| title=Mast cells and fibroblasts work in concert to aggravate pulmonary fibrosis: role of transmembrane SCF and the PAR-2/PKC-α/Raf-1/p44/42 signaling pathway. | journal=Am J Pathol | year= 2013 | volume= 182 | issue= 6 | pages= 2094-108 | pmid=23562441 | doi=10.1016/j.ajpath.2013.02.013 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23562441  }} </ref>|P03=[[IGFBP3|IGF-binding protein 3 (IGFBP-3]])|P04=[[Insulin-like growth factor binding protein|IGF-binding protein 5 (IGFBP-5)]]<ref name="pmid21511034">{{cite journal| author=Bhattacharyya S, Wu M, Fang F, Tourtellotte W, Feghali-Bostwick C, Varga J| title=Early growth response transcription factors: key mediators of fibrosis and novel targets for anti-fibrotic therapy. | journal=Matrix Biol | year= 2011 | volume= 30 | issue= 4 | pages= 235-42 | pmid=21511034 | doi=10.1016/j.matbio.2011.03.005 | pmc=3135176 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21511034  }} </ref>|P05=Upregulation of Egr-1 (early growth response protein 1)<ref name="pmid19628764">{{cite journal| author=Yasuoka H, Hsu E, Ruiz XD, Steinman RA, Choi AM, Feghali-Bostwick CA| title=The fibrotic phenotype induced by IGFBP-5 is regulated by MAPK activation and egr-1-dependent and -independent mechanisms. | journal=Am J Pathol | year= 2009 | volume= 175 | issue= 2 | pages= 605-15 | pmid=19628764 | doi=10.2353/ajpath.2009.080991 | pmc=2716960 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19628764  }} </ref>|P06=Loss of [[endothelial]] barrier function }}
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{{Family tree| O01 |!| | |!| | | |`|-|-|-|^|.| | | | |!| O02 | | | | | |!| | | | | | | | O01=Dysregulation of repair in [[lung tissue]]  and activation of [[fibroblasts]]<ref name="pmid23881674">{{cite journal| author=Sun Z, Gong X, Zhu H, Wang C, Xu X, Cui D et al.| title=Inhibition of Wnt/β-catenin signaling promotes engraftment of mesenchymal stem cells to repair lung injury. | journal=J Cell Physiol | year= 2014 | volume= 229 | issue= 2 | pages= 213-24 | pmid=23881674 | doi=10.1002/jcp.24436 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23881674  }} </ref>|O02=Regulates [[transforming growth factor-β]] ([[TGF-β]]) }}
{{Family tree| | | |!| | |!| | | | | | | | |!| | | | |!|,|'| | | | | | |!| | | | | | | | }}
{{Family tree| | | |!| | |!| | | | | | | | |!| | | | A02 | | | | | | | |!| | | | | | | | A01=|A02=Induction of [[syndecan-2|syndecan-2 (SDC2)]]<ref name="pmid22900087">{{cite journal| author=Ruiz XD, Mlakar LR, Yamaguchi Y, Su Y, Larregina AT, Pilewski JM et al.| title=Syndecan-2 is a novel target of insulin-like growth factor binding protein-3 and is over-expressed in fibrosis. | journal=PLoS One | year= 2012 | volume= 7 | issue= 8 | pages= e43049 | pmid=22900087 | doi=10.1371/journal.pone.0043049 | pmc=3416749 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=22900087  }} </ref>}}
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{{Family tree| | | |`|-|-|-|-|-|-|-|-|-|-| B01 | | | | | | | | | | | | |!| | | | | | | | B01=Activation,proliferation, and migration of [[fibroblast]] to the site of injury}}
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{{Family tree| | | | | | | | | | | | | | | C01 | | | | | | | | | | | | |!| | | | | | | | C01=[[Fibroblasts]]}}
{{Family tree| | | | | | | | | | | | |,|-|-|+|-|-|.| | | | | | | | | | |!| | | | | | | | }}
{{Family tree| | | | | | | | | | | | D01 | |!| | D02 | | | | | | | | | |!| | | | | | | | D01=Altered PTEN (phosphatase and tensin homologue)/Akt axis|D02=Acquire contractile stress fibres}}
{{Family tree| | | | | | | | | | | | |!| | |!| | |!| | | | | | | | | | |!| | | | | | | | }}
{{Family tree| | | | | | | | | | | | G01 | |!| | G02 | | G03 | | | | | |!| | | | | | | | G01= Inactivates [[FOX proteins|Fox (forkhead box) O3a]]<ref name="pmid23580232">{{cite journal| author=Nho RS, Peterson M, Hergert P, Henke CA| title=FoxO3a (Forkhead Box O3a) deficiency protects Idiopathic Pulmonary Fibrosis (IPF) fibroblasts from type I polymerized collagen matrix-induced apoptosis via caveolin-1 (cav-1) and Fas. | journal=PLoS One | year= 2013 | volume= 8 | issue= 4 | pages= e61017 | pmid=23580232 | doi=10.1371/journal.pone.0061017 | pmc=3620276 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23580232  }} </ref>|G02=Protomyofibroblast, composed of cytoplasmic [[actins]]|G03=[[Pleural]] [[mesothelial]] cells (PMCs)<ref name="pmid21737551">{{cite journal| author=Mubarak KK, Montes-Worboys A, Regev D, Nasreen N, Mohammed KA, Faruqi I et al.| title=Parenchymal trafficking of pleural mesothelial cells in idiopathic pulmonary fibrosis. | journal=Eur Respir J | year= 2012 | volume= 39 | issue= 1 | pages= 133-40 | pmid=21737551 | doi=10.1183/09031936.00141010 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21737551  }} </ref><ref name="pmid19411308">{{cite journal| author=Nasreen N, Mohammed KA, Mubarak KK, Baz MA, Akindipe OA, Fernandez-Bussy S et al.| title=Pleural mesothelial cell transformation into myofibroblasts and haptotactic migration in response to TGF-beta1 in vitro. | journal=Am J Physiol Lung Cell Mol Physiol | year= 2009 | volume= 297 | issue= 1 | pages= L115-24 | pmid=19411308 | doi=10.1152/ajplung.90587.2008 | pmc=2711818 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19411308  }} </ref>}}
{{Family tree| | | | | | | | | | | | |!| | |!| | |!| | | |!| | | | | | |!| | | | | | | | }}
{{Family tree| | | | | | | | | | | | H01 | |!| | H02 | | H03 | | | | | |!| | | | | | | | H01= Downregulation of [[Caveolin 1|caveolin-1 (cav-1)]] and Fas expression<ref name="pmid18759267">{{cite journal| author=Del Galdo F, Sotgia F, de Almeida CJ, Jasmin JF, Musick M, Lisanti MP et al.| title=Decreased expression of caveolin 1 in patients with systemic sclerosis: crucial role in the pathogenesis of tissue fibrosis. | journal=Arthritis Rheum | year= 2008 | volume= 58 | issue= 9 | pages= 2854-65 | pmid=18759267 | doi=10.1002/art.23791 | pmc=2770094 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=18759267  }} </ref>|H02=De novo expression of α-smooth muscle actin (α-SMA)|H03=TGF-β1-dependent mesothelial–mesenchymal transition}}
{{Family tree| | | | | | | | | | | | |!| | |!| | | |!| |!| | | | | | | |!| | | | | | | | }}
{{Family tree| | | | | | | | | | | | I01 | |!| | | | I02 | | | | | | | |!| | | | | | | | I01=[[Fibroblast]] resistant to [[apoptosis]]<ref name="pmid16738200">{{cite journal| author=Thannickal VJ, Horowitz JC| title=Evolving concepts of apoptosis in idiopathic pulmonary fibrosis. | journal=Proc Am Thorac Soc | year= 2006 | volume= 3 | issue= 4 | pages= 350-6 | pmid=16738200 | doi=10.1513/pats.200601-001TK | pmc=2231523 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16738200  }} </ref>|I02=[[Myofibroblasts]]<ref name="pmid11988769">{{cite journal| author=Tomasek JJ, Gabbiani G, Hinz B, Chaponnier C, Brown RA| title=Myofibroblasts and mechano-regulation of connective tissue remodelling. | journal=Nat Rev Mol Cell Biol | year= 2002 | volume= 3 | issue= 5 | pages= 349-63 | pmid=11988769 | doi=10.1038/nrm809 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11988769  }} </ref>}}
{{Family tree| | | | | | | | | | | | | | | |!| | | |!| |!| | | | | | | |!| | | | | | | | }}
{{Family tree| | | | | | | | | | | | | | | |!| | | |!| |)|-|-|-|-|.| | |!| | | | | | | | }}
{{Family tree| | | | | | | | | | | | | | | |!| | | |!| J02 | | | J03 | |!| | | | | | | | J02=Different ranges of contractions mediated by RhoA/Rho-associated kinase|J03=Changes in intracellular calcium concentrations}}
{{Family tree| | | | | | | | | | | | | | | |!| | | |!| | |`|-|v|-|'| | |!| | | | | | | | }}
{{Family tree| | | | | | | | K01 | | | | | |!| |,|-|'| | | | K02 | | | |!| | | | | K03 | K01=Recruitement of fibrocytes in [[lungs]]|K02=Lock step mechanism of cyclic and contractile events<ref name="pmid20427321">{{cite journal| author=Castella LF, Buscemi L, Godbout C, Meister JJ, Hinz B| title=A new lock-step mechanism of matrix remodelling based on subcellular contractile events. | journal=J Cell Sci | year= 2010 | volume= 123 | issue= Pt 10 | pages= 1751-60 | pmid=20427321 | doi=10.1242/jcs.066795 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=20427321  }} </ref>|K03=[[T helper cell|T-helper cell type 2]] on site of injury<ref name="pmid15802346">{{cite journal| author=Capelli A, Di Stefano A, Gnemmi I, Donner CF| title=CCR5 expression and CC chemokine levels in idiopathic pulmonary fibrosis. | journal=Eur Respir J | year= 2005 | volume= 25 | issue= 4 | pages= 701-7 | pmid=15802346 | doi=10.1183/09031936.05.00082604 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15802346  }} </ref><ref name="pmid15383605">{{cite journal| author=Belperio JA, Dy M, Murray L, Burdick MD, Xue YY, Strieter RM et al.| title=The role of the Th2 CC chemokine ligand CCL17 in pulmonary fibrosis. | journal=J Immunol | year= 2004 | volume= 173 | issue= 7 | pages= 4692-8 | pmid=15383605 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15383605  }} </ref>}}
{{Family tree| | | | | | | | |!| | | | | | |!| |!| | | | | | |!| | | | |!| | | | | |!| | }}
{{Family tree| | | | | | | | L01 | | | | | | L02 | | | | | | L03 | | | |!| | | | | L04 | |L01=Upregulation of [[CXCR4|C-X-C chemokine receptor type 4 (CXCR4)]]<br>on [[fibrocytes]] and its ligand<br>CXCL12 (stromal cell-derived factor 1)<ref name="pmid18374622">{{cite journal| author=Andersson-Sjöland A, de Alba CG, Nihlberg K, Becerril C, Ramírez R, Pardo A et al.| title=Fibrocytes are a potential source of lung fibroblasts in idiopathic pulmonary fibrosis. | journal=Int J Biochem Cell Biol | year= 2008 | volume= 40 | issue= 10 | pages= 2129-40 | pmid=18374622 | doi=10.1016/j.biocel.2008.02.012 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=18374622  }} </ref>|L02=Excess extracellular matrix production|L03=Exerting traction force|L04=[[Interleukin-13]]}}
{{Family tree| | | | | | | | |!| | | | | | | |!|,|-|-|-|-|-|-|'| | | | |!| | | | | |!| | }}
{{Family tree| | | | | | | | M01 | | | | | | M02 | | | | | | | | | | | |!| | | | | M03 | |M01=Migration of fibrocytes to the site of injury<ref name="pmid15743780">{{cite journal| author=Moore BB, Kolodsick JE, Thannickal VJ, Cooke K, Moore TA, Hogaboam C et al.| title=CCR2-mediated recruitment of fibrocytes to the alveolar space after fibrotic injury. | journal=Am J Pathol | year= 2005 | volume= 166 | issue= 3 | pages= 675-84 | pmid=15743780 | doi=10.1016/S0002-9440(10)62289-4 | pmc=1780139 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15743780  }} </ref>|M02=Tissue remodelling<ref name="pmid17525249">{{cite journal| author=Hinz B, Phan SH, Thannickal VJ, Galli A, Bochaton-Piallat ML, Gabbiani G| title=The myofibroblast: one function, multiple origins. | journal=Am J Pathol | year= 2007 | volume= 170 | issue= 6 | pages= 1807-16 | pmid=17525249 | doi=10.2353/ajpath.2007.070112 | pmc=1899462 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=17525249  }} </ref>|M03=Alternate pathway activation of [[macrophages]]<ref name="pmid7995399">{{cite journal| author=Lohmann-Matthes ML, Steinmüller C, Franke-Ullmann G| title=Pulmonary macrophages. | journal=Eur Respir J | year= 1994 | volume= 7 | issue= 9 | pages= 1678-89 | pmid=7995399 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=7995399  }} </ref>}}
{{Family tree| | | | | | | | |!| | | | | | | |!| | | | | | | | | | | | |!| | | | | |!| | }}
{{Family tree| | | | | | | | |`|-|-|-|-|-|-|.|!|,|-|-|-|-|-|-|-|-|-|-|-|'| | | | | |!| | }}
{{Family tree| | | | | | | | | | | | | | | | N01 |-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|'| N01=Lung Fibrosis}}
{{Family tree/end}}
 
==Differentiating Interstitial Lung Disease from other Diseases==
'''''To review the complete differential diagnosis of dyspnea, [[Dyspnea differential diagnosis|click here.]]'''''
 
'''''To review the complete differential diagnosis of hemoptysis, [[Hemoptysis differential diagnosis|click here.]]'''''
 
'''''To review the complete differential diagnosis of restrictive lung disease, [[Restrictive lung disease|click here.]]'''''
<small>
 
'''Abbreviations''': '''ABG''': Arterial blood gas, '''BAL''': Bronchoalveolar lavage, '''ESR''': Erythrocyte sedimentation rate, '''CRP''': C–reactive protein, '''FVC''': Forced vital capacity, '''RV''': Residual volume, '''FEV1''': Forced expiratory volume during the 1st second, '''DLCO''': Diffusing capacity of the lungs for carbon monoxide, '''O2''': Oxygen, '''TLC''': Total lung capacity, '''PaO2''': Arterial partial pressure of oxygen, '''FiO2''': Fraction of inspired oxygen, '''LDH''': Lactate dehydrogenase, '''CEA''': Carcinoembryonic antigen, '''Anti-GBM antibody''': Anti-glomerular basement membrane antibody, '''A−a gradient''': Alveolar-arterial gradient, '''PAS''': Periodic acid-Schiff stain, '''LAM''': Lymphangiomyomatosis, '''IgE''': Immunoglobulin E, '''ANCA''': Anti-neutrophil cytoplasmic antibody, '''RBC''': Red blood cell, '''ACE''': Angiotensin-converting enzyme
 
<small><small>
 
{| class="wikitable"
! colspan="2" rowspan="3" style="background:#4479BA; color: #FFFFFF;" align="center" |Disease
! colspan="15" style="background:#4479BA; color: #FFFFFF;" align="center" |Clinical manifestation
! colspan="6" style="background:#4479BA; color: #FFFFFF;" align="center" |Investigations
|-
! colspan="7" style="background:#4479BA; color: #FFFFFF;" align="center" |History
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Symptoms
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Physical examination
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Lab findings
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Imaging
! colspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Pulmonary function test
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Bronchoscopy and BAL
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Gold standard
|-
! style="background:#4479BA; color: #FFFFFF;" align="center" |Duration
! style="background:#4479BA; color: #FFFFFF;" align="center" |Age
! style="background:#4479BA; color: #FFFFFF;" align="center" |Gender
! style="background:#4479BA; color: #FFFFFF;" align="center" |Family history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Smoking history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Environmental exposure
! style="background:#4479BA; color: #FFFFFF;" align="center" |HIV
! style="background:#4479BA; color: #FFFFFF;" align="center" |Dyspnea
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cough
! style="background:#4479BA; color: #FFFFFF;" align="center" |Wheezing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Chest pain
! style="background:#4479BA; color: #FFFFFF;" align="center" |Tachypnea  
! style="background:#4479BA; color: #FFFFFF;" align="center" |Auscultation
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cyanosis
! style="background:#4479BA; color: #FFFFFF;" align="center" |Clubbing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Spirometry
! style="background:#4479BA; color: #FFFFFF;" align="center" |ABG
|-
! colspan="2" style="background:#DCDCDC;" align="center" |[[Idiopathic pulmonary fibrosis]]<ref name="PolettiRavaglia2013">{{cite journal|last1=Poletti|first1=Venerino|last2=Ravaglia|first2=Claudia|last3=Buccioli|first3=Matteo|last4=Tantalocco|first4=Paola|last5=Piciucchi|first5=Sara|last6=Dubini|first6=Alessandra|last7=Carloni|first7=Angelo|last8=Chilosi|first8=Marco|last9=Tomassetti|first9=Sara|title=Idiopathic Pulmonary Fibrosis: Diagnosis and Prognostic Evaluation|journal=Respiration|volume=86|issue=1|year=2013|pages=5–12|issn=1423-0356|doi=10.1159/000353580}}</ref>
| align="center" |Chronic
| align="center" |60−70 years old
| align="center" |Men
| align="center" | +
| align="center" | +
| align="center" |±
| align="center" | −
| align="center" | +
| align="center" |Dry
| align="center" | +
| align="center" | +
| align="center" | +
|
* Inspiratory high−pitched [[rhonchi]]
* Bibasilar inspiratory [[Rales|crackles]]
| align="center" | −
| align="center" | +
|
* [[Anti-nuclear antibody|Antinuclear antibody]] +
* [[Rheumatoid factor]] +
* Elevated [[Erythrocyte sedimentation rate|ESR]]
* Elevated [[C-reactive protein|CRP]]
* [[Polycythemia]]
|
* Bibasilar, peripheral reticular abnormalities
* Focal honeycomb cyst formation
* Traction [[bronchiectasis]]
|
* ↓ [[Vital capacity|FVC]]
 
* ↑ [[Residual volume|RV]]
* Normal [[FEV1/FVC ratio|FEV1/FVC]]
* ↓ [[DLCO]]
|
* ↓ [[Oxygen|O2]]
|
* Not required
* ↑ [[Neutrophil|Neutrophils]] 
* ↑ [[Eosinophil granulocyte|Eosinophils]] 
|
* Diagnosis of exclusion 
* Lung [[biopsy]]
|-
! colspan="2" style="background:#DCDCDC;" align="center" s |Idiopathic nonspecific interstitial pneumonia<ref name="TravisHunninghake2008">{{cite journal|last1=Travis|first1=William D.|last2=Hunninghake|first2=Gary|last3=King|first3=Talmadge E.|last4=Lynch|first4=David A.|last5=Colby|first5=Thomas V.|last6=Galvin|first6=Jeffrey R.|last7=Brown|first7=Kevin K.|last8=Chung|first8=Man Pyo|last9=Cordier|first9=Jean-François|last10=du Bois|first10=Roland M.|last11=Flaherty|first11=Kevin R.|last12=Franks|first12=Teri J.|last13=Hansell|first13=David M.|last14=Hartman|first14=Thomas E.|last15=Kazerooni|first15=Ella A.|last16=Kim|first16=Dong Soon|last17=Kitaichi|first17=Masanori|last18=Koyama|first18=Takashi|last19=Martinez|first19=Fernando J.|last20=Nagai|first20=Sonoko|last21=Midthun|first21=David E.|last22=Müller|first22=Nestor L.|last23=Nicholson|first23=Andrew G.|last24=Raghu|first24=Ganesh|last25=Selman|first25=Moisés|last26=Wells|first26=Athol|title=Idiopathic Nonspecific Interstitial Pneumonia|journal=American Journal of Respiratory and Critical Care Medicine|volume=177|issue=12|year=2008|pages=1338–1347|issn=1073-449X|doi=10.1164/rccm.200611-1685OC}}</ref>
| align="center" |Acute/Chronic
| align="center" |50−60 years old
| align="center" |Female
| align="center" | +
| align="center" |−
| align="center" | −
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" |−
| align="center" | +
|
* Bibasilar [[Rales|crackles]]
| align="center" | −
| align="center" |±
|
* Normal
|
* Bilateral ground−glass opacities 
* Fine reticular infiltrates
* Traction [[bronchiectasis]]
* [[Consolidation (medicine)|Consolidation]]
|
* Normal to ↑ [[FEV1/FVC ratio|FEV1/FVC]]
* ↓ [[Vital capacity|FVC]] 
* ↓ [[Total lung capacity|TLC]]
|
* ↓ [[Oxygen|O2]]
|
* Nonspecific
|
* Lung [[biopsy]] and multidisciplinary approach
|-
! colspan="2" style="background:#DCDCDC;" align="center" |[[Cryptogenic organizing pneumonia]]<ref name="MehrianDoroudinia2017">{{cite journal|last1=Mehrian|first1=P.|last2=Doroudinia|first2=A.|last3=Rashti|first3=A.|last4=Aloosh|first4=O.|last5=Dorudinia|first5=A.|title=High-resolution computed tomography findings in chronic eosinophilic vs. cryptogenic organising pneumonia|journal=The International Journal of Tuberculosis and Lung Disease|volume=21|issue=11|year=2017|pages=1181–1186|issn=1027-3719|doi=10.5588/ijtld.16.0723}}</ref>
| align="center" |Acute/subacute
| align="center" |50−60 years old
| align="center" |Both
| align="center" |−
| align="center" |±
| align="center" |−
| align="center" |−
| align="center" | +
| align="center" |Dry
| align="center" | −
| align="center" |−
| align="center" |−
|
* Inspiratory [[Rales|crackles]]
| align="center" | −
| align="center" |−
|
* [[Leukocytosis]]
 
* Elevated [[Erythrocyte sedimentation rate|ESR]]
* Elevated [[C-reactive protein|CRP]]
|
* [[Alveolus|Alveolar]] filling and air bronchograms
* Bilateral ground−glass opacities 
* Bilateral [[Consolidation (medicine)|consolidation]]
|
* ↓ [[Vital capacity|FVC]]
 
* Normal [[FEV1/FVC ratio|FEV1/FVC]]
* ↓ [[DLCO]]
|
* ↓ [[Oxygen|O2]]
|
* ↑ [[Lymphocyte|Lymphocytes]]
 
* ↑ [[Neutrophil|Neutrophils]] 
* ↑ [[Eosinophil granulocyte|Eosinophils]] 
|
* Lung [[biopsy]]
|-
! colspan="2" rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Disease
! colspan="7" style="background:#4479BA; color: #FFFFFF;" align="center" |History
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Symptoms
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Physical examination
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Lab findings
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Imaging
! colspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Pulmonary function test
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Bronchoscopy and BAL
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Gold standard
|-
! style="background:#4479BA; color: #FFFFFF;" align="center" |Duration
! style="background:#4479BA; color: #FFFFFF;" align="center" |Age
! style="background:#4479BA; color: #FFFFFF;" align="center" |Gender
! style="background:#4479BA; color: #FFFFFF;" align="center" |Family history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Smoking history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Environmental exposure
! style="background:#4479BA; color: #FFFFFF;" align="center" |HIV
! style="background:#4479BA; color: #FFFFFF;" align="center" |Dyspnea
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cough
! style="background:#4479BA; color: #FFFFFF;" align="center" |Wheezing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Chest pain
! style="background:#4479BA; color: #FFFFFF;" align="center" |Tachypnea  
! style="background:#4479BA; color: #FFFFFF;" align="center" |Auscultation
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cyanosis
! style="background:#4479BA; color: #FFFFFF;" align="center" |Clubbing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Spirometry
! style="background:#4479BA; color: #FFFFFF;" align="center" |ABG
|-
! colspan="2" style="background:#DCDCDC;" align="center" |Acute [[interstitial pneumonia]] (Hamman−Rich syndrome)<ref name="ParambilMukhopadhyay2012">{{cite journal|last1=Parambil|first1=Joseph|last2=Mukhopadhyay|first2=Sanjay|title=Acute Interstitial Pneumonia (AIP): Relationship to Hamman-Rich Syndrome, Diffuse Alveolar Damage (DAD), and Acute Respiratory Distress Syndrome (ARDS)|journal=Seminars in Respiratory and Critical Care Medicine|volume=33|issue=05|year=2012|pages=476–485|issn=1069-3424|doi=10.1055/s-0032-1325158}}</ref>
| align="center" |Acute
| align="center" |50−60 years old
| align="center" |Both
| align="center" | −
| align="center" |−
| align="center" |−
| align="center" |−
| align="center" | +
| align="center" | +
| align="center" |−
| align="center" |−
| align="center" | +
|
* Diffuse [[Rales|crackles]]
| align="center" | −
| align="center" | −
|
* [[Leukocytosis]] 
|
* Bilateral and symmetric, diffuse ground glass
* [[Alveolus|Alveolar]] consolidation opacities
* Traction [[bronchiectasis]]
* Honeycomb [[fibrosis]] 
|
* N/A
|
* ↓ [[Oxygen|O2]]
* [[Pulmonary gas pressures|PaO2]]/[[FiO2]] <200 mmHg
|
* Nonspecific
* ↑ [[Neutrophil|Neutrophils]] 
* ↑ Atypical [[Epithelium|epithelial cells]]
|
* Lung [[biopsy]]
|-
! colspan="2" style="background:#DCDCDC;" align="center" |Lymphocytic [[interstitial pneumonia]]<ref name="PanchabhaiFarver2016">{{cite journal|last1=Panchabhai|first1=Tanmay S.|last2=Farver|first2=Carol|last3=Highland|first3=Kristin B.|title=Lymphocytic Interstitial Pneumonia|journal=Clinics in Chest Medicine|volume=37|issue=3|year=2016|pages=463–474|issn=02725231|doi=10.1016/j.ccm.2016.04.009}}</ref>
| align="center" |Subacute
| align="center" |30−40 years old
| align="center" |Female
| align="center" |−
| align="center" |−
| align="center" |−
| align="center" |±
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" | −
|
* Diffuse [[Rales|crackles]]
| align="center" | −
| align="center" | +
|
* [[Gammopathy]]
|
* Diffuse ground glass attenuation with [[fibrosis]]
* Centrilobular and subpleural [[Nodule (medicine)|nodules]]
* Lung [[Cyst|cysts]]
|
* ↓ [[Vital capacity|FVC]]
* ↓ [[Total lung capacity|TLC]]
* ↓ [[DLCO]]
|
* ↓ [[Oxygen|O2]]
|
* Nonspecific
* ↑ Total [[Bronchoalveolar lavage|BAL]] cell count
* [[Bronchoalveolar lavage|BAL]] [[lymphocytosis]]
|
* Lung [[biopsy]]
|-
! colspan="2" style="background:#DCDCDC;" align="center" |Respiratory bronchiolitis−interstitial lung disease<ref name="SieminskaKuziemski2014">{{cite journal|last1=Sieminska|first1=Alicja|last2=Kuziemski|first2=Krzysztof|title=Respiratory bronchiolitis-interstitial lung disease|journal=Orphanet Journal of Rare Diseases|volume=9|issue=1|year=2014|issn=1750-1172|doi=10.1186/s13023-014-0106-8}}</ref>
| align="center" |Subacute
| align="center" |30−40 years old
| align="center" |Both
| align="center" |−
| align="center" | +
| align="center" |−
| align="center" | −
| align="center" | +
| align="center" |Dry
| align="center" | +
| align="center" | −
| align="center" | −
|
* Inspiratory high−pitched [[rhonchi]]
* Fine, bibasilar end−inspiratory [[Rales|crackles]]
| align="center" |−
| align="center" |−
|
* Nonspecific 
|
* Diffuse or patchy ground glass opacities in a mosaic pattern 
* Fine [[Nodule (medicine)|nodules]] 
* Air trapping
|
* ↓ [[Vital capacity|FVC]]
* ↓ [[Total lung capacity|TLC]]
* ↓ [[DLCO]]
|
* ↓ [[Oxygen|O2]]
|
* ↑ [[Macrophage|Macrophages]]
|
* Clinical evaluation and investigations
|-
! colspan="2" style="background:#DCDCDC;" align="center" |Desquamative interstitial pneumonia<ref name="RyuMyers2005">{{cite journal|last1=Ryu|first1=Jay H.|last2=Myers|first2=Jeffrey L.|last3=Capizzi|first3=Stephen A.|last4=Douglas|first4=William W.|last5=Vassallo|first5=Robert|last6=Decker|first6=Paul A.|title=Desquamative Interstitial Pneumonia and Respiratory Bronchiolitis-Associated Interstitial Lung Disease|journal=Chest|volume=127|issue=1|year=2005|pages=178–184|issn=00123692|doi=10.1378/chest.127.1.178}}</ref><ref name="CraigWells2004">{{cite journal|last1=Craig|first1=P J|last2=Wells|first2=A U|last3=Doffman|first3=S|last4=Rassl|first4=D|last5=Colby|first5=T V|last6=Hansell|first6=D M|last7=du Bois|first7=R M|last8=Nicholson|first8=A G|title=Desquamative interstitial pneumonia, respiratory bronchiolitis and their relationship to smoking|journal=Histopathology|volume=45|issue=3|year=2004|pages=275–282|issn=0309-0167|doi=10.1111/j.1365-2559.2004.01921.x}}</ref>
| align="center" |Chronic
| align="center" |40−50 years old
| align="center" |Both
| align="center" |−
| align="center" | +
| align="center" |−
| align="center" |−
| align="center" | +
| align="center" |Dry
| align="center" | +
| align="center" |−
| align="center" |−
|
* Fine, bibasilar end−inspiratory [[Rales|crackles]]
| align="center" |−
| align="center" |−
|
* Nonspecific 
|
* Ground glass opacities without the peripheral reticular and reticulonodular opacities
|
* ↓ [[DLCO]]
|
* ↓ [[Oxygen|O2]]
|
* ↑ [[Eosinophil granulocyte|Eosinophils]] 
|
* Lung [[biopsy]]
|-
! colspan="2" rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Disease
! colspan="7" style="background:#4479BA; color: #FFFFFF;" align="center" |History
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Symptoms
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Physical examination
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Lab findings
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Imaging
! colspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Pulmonary function test
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Bronchoscopy and BAL
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Gold standard
|-
! style="background:#4479BA; color: #FFFFFF;" align="center" |Duration
! style="background:#4479BA; color: #FFFFFF;" align="center" |Age
! style="background:#4479BA; color: #FFFFFF;" align="center" |Gender
! style="background:#4479BA; color: #FFFFFF;" align="center" |Family history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Smoking history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Environmental exposure
! style="background:#4479BA; color: #FFFFFF;" align="center" |HIV
! style="background:#4479BA; color: #FFFFFF;" align="center" |Dyspnea
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cough
! style="background:#4479BA; color: #FFFFFF;" align="center" |Wheezing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Chest pain
! style="background:#4479BA; color: #FFFFFF;" align="center" |Tachypnea  
! style="background:#4479BA; color: #FFFFFF;" align="center" |Auscultation
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cyanosis
! style="background:#4479BA; color: #FFFFFF;" align="center" |Clubbing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Spirometry
! style="background:#4479BA; color: #FFFFFF;" align="center" |ABG
|-
! colspan="2" style="background:#DCDCDC;" align="center" |Pulmonary [[Langerhans cell granulomatosis]]<ref name="BlakleyDutcher2018">{{cite journal|last1=Blakley|first1=Matthew P.|last2=Dutcher|first2=Janice P.|last3=Wiernik|first3=Peter H.|title=Pulmonary Langerhans cell histiocytosis, acute myeloid leukemia, and myelofibrosis in a large family and review of the literature|journal=Leukemia Research|volume=67|year=2018|pages=39–44|issn=01452126|doi=10.1016/j.leukres.2018.01.011}}</ref>
| align="center" |Chronic
| align="center" |20−40 years old
| align="center" |Both
| align="center" | +
| align="center" | +
| align="center" |−
| align="center" |−
| align="center" |±
| align="center" |Dry
| align="center" | +
| align="center" | +
| align="center" |−
|
* Unremarkable
|−
|−
|
* Nonspecific 
|
* Mid to upper lung zone [[Cyst|cysts]] and [[Nodule (medicine)|nodules]]
* Reticular and [[Nodule (medicine)|nodular]] opacities
* Recurrent spontaneous [[pneumothorax]]
|
* ↓ [[FEV1/FVC ratio|FEV1/FVC]]
|
* Normal
|
* >5 percent [[Langerhans cell|langerhans cells]] (CD−1a positive)
|
* Lung [[biopsy]]
|-
! colspan="2" style="background:#DCDCDC;" align="center" |[[Pulmonary alveolar proteinosis]]<ref name="pmid29493933">{{cite journal |vauthors=Carrington JM, Hershberger DM |title= |journal= |volume= |issue= |pages= |date= |pmid=29493933 |doi= |url=}}</ref><ref name="KianiParsa2018">{{cite journal|last1=Kiani|first1=Arda|last2=Parsa|first2=Tahereh|last3=Adimi Naghan|first3=Parisa|last4=Dutau|first4=Hervé|last5=Razavi|first5=Fatemeh|last6=Farzanegan|first6=Behrooz|last7=Pourabdollah Tootkaboni|first7=Mahsa|last8=Abedini|first8=Atefeh|title=An eleven-year retrospective cross-sectional study on pulmonary alveolar proteinosis|journal=Advances in Respiratory Medicine|volume=86|issue=1|year=2018|pages=7–12|issn=2543-6031|doi=10.5603/ARM.2018.0003}}</ref>
| align="center" |Acute/chronic
| align="center" |40−50 years old
| align="center" |Male
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" |−
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" |−
| align="center" |−
|
*  Inspiratory [[Rales|crackles]]
| align="center" | +
| align="center" | +
|
* ↑ [[Lactate dehydrogenase|LDH]]
* ↑ [[CEA]]
* ↑ [[Surfactant]] protein A, B, and D
* [[Anti-glomerular basement membrane antibody|Anti-GBM antibody]] +
* [[Polycythemia]]
* [[Hypergammaglobulinemia]]
|
* Bbilateral perihilar and basilar [[Alveolus|alveolar]] opacities without air−bronchograms
* "Bat wing" distribution
* Intralobular thickening
* Diffuse ground−glass opacities
|
* ↑ [[FEV1/FVC ratio|FEV1/FVC]]
* ↑ [[A-a gradient|A−a gradient]]
* ↓ [[DLCO]]
|
* ↓ [[Pulmonary gas pressures|PaO2]]
* ↓ [[Oxygen|O2]]
* [[Respiratory alkalosis]]
|
* Large foamy [[Macrophage|macrophages]] with amorphous [[Periodic acid-Schiff stain|PAS]]−positive material
* ↑  [[Lymphocyte|Lymphocytes]]
|
* [[Bronchoscopy]] and [[Bronchoalveolar lavage|BAL]]
|-
! colspan="2" style="background:#DCDCDC;" align="center" |Pulmonary [[lymphangioleiomyomatosis]]<ref name="XuLo2014">{{cite journal|last1=Xu|first1=Kai-Feng|last2=Lo|first2=Bee Hong|title=Lymphangioleiomyomatosis: differential diagnosis and optimal management|journal=Therapeutics and Clinical Risk Management|year=2014|pages=691|issn=1178-203X|doi=10.2147/TCRM.S50784}}</ref>
| align="center" |Acute/chronic
| align="center" |30−40 years old
| align="center" |Female
| align="center" | +
| align="center" | +
| align="center" |−
| align="center" |−
| align="center" | +
| align="center" |Bloody
| align="center" | +
| align="center" | +
| align="center" |−
|
* Decreased [[breath sounds]]
| align="center" |−
| align="center" | +
|
* ↑ [[Vascular endothelial growth factor|Vascular endothelial growth factor−D]] (VEGF−D)
|
* [[Pneumothorax]]
* [[Chylothorax]]
* Thin−walled round [[Cyst|cystic]] lesions
|
* ↓ [[FEV1/FVC ratio|FEV1/FVC]]
|
* ↓ [[Pulmonary gas pressures|PaO2]]
* ↓ [[Oxygen|O2]]
|
* [[LAM]] cells +
|
* Lung [[biopsy]]
|-
! colspan="2" style="background:#DCDCDC;" align="center" |[[Eosinophilic pneumonia]]<ref name="BernheimMcLoud2017">{{cite journal|last1=Bernheim|first1=Adam|last2=McLoud|first2=Theresa|title=A Review of Clinical and Imaging Findings in Eosinophilic Lung Diseases|journal=American Journal of Roentgenology|volume=208|issue=5|year=2017|pages=1002–1010|issn=0361-803X|doi=10.2214/AJR.16.17315}}</ref>
| align="center" |Acute/chronic
| align="center" |20−40 years old
| align="center" |Male
| align="center" |−
| align="center" |−
| align="center" |−
| align="center" |−
| align="center" | +
| align="center" |Dry
| align="center" | +
| align="center" | +
| align="center" | +
|
* Decreased [[breath sounds]]
| align="center" |−
| align="center" |−
|
* Neutrophilic [[leukocytosis]]
* ↑ [[Eosinophil granulocyte|Eosinophils]]
* Elevated [[Erythrocyte sedimentation rate|ESR]]
* Elevated [[C-reactive protein|CRP]]
* Elevated [[Immunoglobulin E|IgE]] level
|
* Bilateral diffuse mixed ground glass and reticular opacities
* Small bilateral [[Pleural effusion|pleural effusions]]
* Centrilobular [[Nodule (medicine)|nodules]] and air−space [[Consolidation (medicine)|consolidation]]
|
* ↑ [[FEV1/FVC ratio|FEV1/FVC]]
* ↓ [[DLCO]]
|
* ↓ [[Pulmonary gas pressures|PaO2]]
* ↓ [[Oxygen|O2]]
|
* [[Eosinophilia]] 
|
* Clinical evaluation and investigations
|-
! colspan="2" style="background:#DCDCDC;" align="center" |[[Hypersensitivity pneumonitis]]<ref name="MillerAllen2018">{{cite journal|last1=Miller|first1=Ross|last2=Allen|first2=Timothy Craig|last3=Barrios|first3=Roberto J.|last4=Beasley|first4=Mary Beth|last5=Burke|first5=Louise|last6=Cagle|first6=Philip T.|last7=Capelozzi|first7=Vera Luiza|last8=Ge|first8=Yimin|last9=Hariri|first9=Lida P.|last10=Kerr|first10=Keith M.|last11=Khoor|first11=Andras|last12=Larsen|first12=Brandon T.|last13=Mark|first13=Eugene J.|last14=Matsubara|first14=Osamu|last15=Mehrad|first15=Mitra|last16=Mino-Kenudson|first16=Mari|last17=Raparia|first17=Kirtee|last18=Roden|first18=Anja Christiane|last19=Russell|first19=Prudence|last20=Schneider|first20=Frank|last21=Sholl|first21=Lynette M.|last22=Smith|first22=Maxwell Lawrence|title=Hypersensitivity Pneumonitis A Perspective From Members of the Pulmonary Pathology Society|journal=Archives of Pathology & Laboratory Medicine|volume=142|issue=1|year=2018|pages=120–126|issn=0003-9985|doi=10.5858/arpa.2017-0138-SA}}</ref>
| align="center" |Acute/subacute/chronic
| align="center" |40−60 years old
| align="center" |Both
| align="center" |−
| align="center" |±
| align="center" | +
| align="center" | −
| align="center" | +
| align="center" |Dry/productive
| align="center" | +
| align="center" | +
| align="center" | +
|
* Diffuse fine bibasilar [[crackles]]
| align="center" | −
| align="center" | +
|
* Neutrophilic [[leukocytosis]]
|
* Centrilobular ground−glass or nodular opacities of mid−to−upper zone 
* Air−trapping
|
* ↓ [[FEV1]]
* ↓ [[Vital capacity|FVC]]
|
* ↓ [[Pulmonary gas pressures|PaO2]]
* ↓ [[Oxygen|O2]]
|
* [[Lymphocytosis]]
|
* Lung [[biopsy]]
|-
! colspan="2" rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Disease
! colspan="7" style="background:#4479BA; color: #FFFFFF;" align="center" |History
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Symptoms
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Physical examination
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Lab findings
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Imaging
! colspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Pulmonary function test
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Bronchoscopy and BAL
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Gold standard
|-
! style="background:#4479BA; color: #FFFFFF;" align="center" |Duration
! style="background:#4479BA; color: #FFFFFF;" align="center" |Age
! style="background:#4479BA; color: #FFFFFF;" align="center" |Gender
! style="background:#4479BA; color: #FFFFFF;" align="center" |Family history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Smoking history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Environmental exposure
! style="background:#4479BA; color: #FFFFFF;" align="center" |HIV
! style="background:#4479BA; color: #FFFFFF;" align="center" |Dyspnea
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cough
! style="background:#4479BA; color: #FFFFFF;" align="center" |Wheezing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Chest pain
! style="background:#4479BA; color: #FFFFFF;" align="center" |Tachypnea  
! style="background:#4479BA; color: #FFFFFF;" align="center" |Auscultation
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cyanosis
! style="background:#4479BA; color: #FFFFFF;" align="center" |Clubbing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Spirometry
! style="background:#4479BA; color: #FFFFFF;" align="center" |ABG
|-
! colspan="2" style="background:#DCDCDC;" align="center" |[[Occupational lung disease]]<ref name="SirajuddinKanne2009">{{cite journal|last1=Sirajuddin|first1=Arlene|last2=Kanne|first2=Jeffrey P.|title=Occupational Lung Disease|journal=Journal of Thoracic Imaging|volume=24|issue=4|year=2009|pages=310–320|issn=0883-5993|doi=10.1097/RTI.0b013e3181c1a9b3}}</ref>
| align="center" |Chronic
| align="center" |Elderly
| align="center" |Male
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" |−
| align="center" |±
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" | +
|
* Fine [[Rales|crackles]]
| align="center" |Peripheral/central
| align="center" | +
|
* [[Anemia]]
* [[Neutrophilia]]
* Elevated [[Erythrocyte sedimentation rate|ESR]]
* Elevated [[C-reactive protein|CRP]]
* Elevated [[Antibody|immunoglobulin]]
|
* Pleural thickening and [[Plaque|plaques]]
* [[Calcification]]
* Nodular or reticular opacities
* Lobar consolidation
* [[Atelectasis]]
* Parenchymal bands
* Enlarged hilar or mediastinal [[Lymph node|lymph nodes]]
* Granulomata
|
* ↑ [[FEV1/FVC ratio|FEV1/FVC]]
|
* ↓ [[Oxygen|O2]]
* ↑ CO2
* [[Respiratory acidosis]]
|
* Mineral dust +
|
* History of environmental exposure and imaging
* Lung [[biopsy]] not required
|-
! colspan="2" style="background:#DCDCDC;" align="center" |Radiation−induced lung injury<ref name="pmid25854336">{{cite journal |vauthors=Giridhar P, Mallick S, Rath GK, Julka PK |title=Radiation induced lung injury: prediction, assessment and management |journal=Asian Pac. J. Cancer Prev. |volume=16 |issue=7 |pages=2613–7 |date=2015 |pmid=25854336 |doi= |url=}}</ref>
| align="center" |Subacute/chronic
| align="center" |Any age
| align="center" |Both
| align="center" |−
| align="center" |−
| align="center" | +
| align="center" |−
| align="center" | +
| align="center" |Dry
| align="center" | +
| align="center" | +
| align="center" | +
|
* [[Rales|Crackles]]
* [[Pleural friction rub|Pleural rub]]
* Dullness to [[percussion]]
| align="center" | +
| align="center" |−
|
* Nonspecific
|
* Perivascular haziness to patchy [[Alveolus|alveolar]] filling densities
* Straight line effect
* [[Pleural effusion]]
|
* ↓ [[Total lung capacity|TLC]]
* ↓ [[Vital capacity|FVC]]
* ↓ [[Spirometry|FEV1]]
* ↓ [[DLCO]]
|
* ↓ [[Pulmonary gas pressures|PaO2]]
* ↓ [[Oxygen|O2]]
|
* [[Lymphocytosis]]
|
* History of irradiation and clinical presentation
|-
! rowspan="3" style="background:#DCDCDC;" align="center" |Pulmonary hemorrhage syndromes
! style="background:#DCDCDC;" align="center" |[[Goodpasture syndrome]]<ref name="pmid29083697">{{cite journal |vauthors=DeVrieze BW, Hurley JA |title= |journal= |volume= |issue= |pages= |date= |pmid=29083697 |doi= |url=}}</ref>
| align="center" |Chronic
| align="center" |All ages
| align="center" |Male
| align="center" | +
| align="center" |±
| align="center" | −
| align="center" |−
| align="center" |±
| align="center" |Bloody
| align="center" |±
| align="center" |−
| align="center" |−
|
* Bilateral coarse [[crepitations]]
| align="center" |−
| align="center" |−
|
* [[Anti-glomerular basement membrane antibody|Anti-GBM antibody]] +
* [[Anti-neutrophil cytoplasmic antibody|ANCA]] +
* [[Anemia]]
* [[Red blood cell|RBC]] in the urine
|
* Pulmonary infiltrates
|
* ↑ [[DLCO]]
|
* Normal
|
* NA
|
* Kidney [[biopsy]]
|-
! style="background:#DCDCDC;" align="center" |Idiopathic pulmonary hemosiderosis<ref name="KhorashadiWu2015">{{cite journal|last1=Khorashadi|first1=L.|last2=Wu|first2=C.C.|last3=Betancourt|first3=S.L.|last4=Carter|first4=B.W.|title=Idiopathic pulmonary haemosiderosis: spectrum of thoracic imaging findings in the adult patient|journal=Clinical Radiology|volume=70|issue=5|year=2015|pages=459–465|issn=00099260|doi=10.1016/j.crad.2014.11.007}}</ref>
| align="center" |Acute/subacute/chronic
| align="center" |Children − 10 years old
| align="center" |Both
| align="center" | +
| align="center" |±
| align="center" | −
| align="center" |−
| align="center" | +
| align="center" |Bloody
| align="center" | +
| align="center" | +
| align="center" |−
|
* [[Rales|Crackles]]
| align="center" | −
| align="center" |−
|
* [[Iron deficiency anemia]]
* ↑ Plasma [[bilirubin]]
* ↑ Urinary excretion of [[urobilinogen]]
* ↑ [[Reticulocytes]]
* [[Fecal occult blood]] +
|
* Mid to lower zone [[Alveolus|alveolar]] opacities
* Multiple honeycomb [[Cyst|cysts]]
|
* ↓ [[Lung volumes|TLC]]
* ↓ [[Vital capacity|FVC]]
* ↓ [[Spirometry|FEV1]]
* ↑ [[FEV1/FVC ratio|FEV1/FVC]]
* ↑ [[DLCO]]
|
* ↓ [[Oxygen|O2]]
* ↓ CO2
|
* ↑  [[Hemosiderin]]−laden [[Macrophage|macrophages]]
|
* Clinical evaluation and investigations
|-
! style="background:#DCDCDC;" align="center" |Isolated pulmonary capillaritis<ref name="ThompsonKlecka2016">{{cite journal|last1=Thompson|first1=Gwen|last2=Klecka|first2=Mary|last3=Roden|first3=Anja C.|last4=Specks|first4=Ulrich|last5=Cartin-Ceba|first5=Rodrigo|title=Biopsy-proven pulmonary capillaritis: A retrospective study of aetiologies including an in-depth look at isolated pulmonary capillaritis|journal=Respirology|volume=21|issue=4|year=2016|pages=734–738|issn=13237799|doi=10.1111/resp.12738}}</ref>
| align="center" |Chronic
| align="center" |40−60 years old
| align="center" |Both
| align="center" | +
| align="center" |−
| align="center" |±
| align="center" | −
| align="center" | +
| align="center" |Bloody
| align="center" | +
| align="center" | +
| align="center" | +
|
* Decreased [[breath sounds]]
| align="center" |−
| align="center" |−
|
* [[Anemia]]
* [[Leukocytosis]]
|
* Diffuse [[Alveolus|alveolar]] haemorrhage
|
* ↓ [[FEV1/FVC ratio|FEV1/FVC]]
|
* ↓ [[Oxygen|O2]]
|
* Diffuse [[Alveolus|alveolar]] haemorrhage
|
* Diagnosis of exclusion
|-
! colspan="2" rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Disease
! colspan="7" style="background:#4479BA; color: #FFFFFF;" align="center" |History
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Symptoms
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Physical examination
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Lab findings
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Imaging
! colspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Pulmonary function test
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Bronchoscopy and BAL
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Gold standard
|-
! style="background:#4479BA; color: #FFFFFF;" align="center" |Duration
! style="background:#4479BA; color: #FFFFFF;" align="center" |Age
! style="background:#4479BA; color: #FFFFFF;" align="center" |Gender
! style="background:#4479BA; color: #FFFFFF;" align="center" |Family history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Smoking history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Environmental exposure
! style="background:#4479BA; color: #FFFFFF;" align="center" |HIV
! style="background:#4479BA; color: #FFFFFF;" align="center" |Dyspnea
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cough
! style="background:#4479BA; color: #FFFFFF;" align="center" |Wheezing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Chest pain
! style="background:#4479BA; color: #FFFFFF;" align="center" |Tachypnea  
! style="background:#4479BA; color: #FFFFFF;" align="center" |Auscultation
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cyanosis
! style="background:#4479BA; color: #FFFFFF;" align="center" |Clubbing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Spirometry
! style="background:#4479BA; color: #FFFFFF;" align="center" |ABG
|-
! colspan="2" style="background:#DCDCDC;" align="center" |[[Sarcoidosis]]<ref name="LiTao2018">{{cite journal|last1=Li|first1=Cheng-Wei|last2=Tao|first2=Ru-Jia|last3=Zou|first3=Dan-Feng|last4=Li|first4=Man-Hui|last5=Xu|first5=Xin|last6=Cao|first6=Wei-Jun|title=Pulmonary sarcoidosis with and without extrapulmonary involvement: a cross-sectional and observational study in China|journal=BMJ Open|volume=8|issue=2|year=2018|pages=e018865|issn=2044-6055|doi=10.1136/bmjopen-2017-018865}}</ref>
| align="center" |Acute/subacute/chronic
| align="center" |20−40 years old
| align="center" |Female
| align="center" | +
| align="center" |±
| align="center" | −
| align="center" | −
| align="center" |±
| align="center" | +
| align="center" | +
| align="center" |±
| align="center" | −
|
* [[Rales|Crackles]]
* [[Wheeze|Wheezing]]
* Decreased [[breath sounds]]
| align="center" | +
| align="center" | −
|
* [[Hypercalciuria]] 
* [[Hypercalcemia]]
* High [[Angiotensin-converting enzyme|ACE]]
* [[Hypergammaglobulinemia]]
|
* [[Hilar lymphadenopathy|Hilar adenopathy]]
* Reticular opacities
* [[Pneumothorax]]
* [[Pleural cavity|Pleural]] thickening
* [[Chylothorax]]
* [[Pulmonary hypertension]]
|
* ↓ [[Lung volumes|TLC]]
* ↓ [[Vital capacity|FVC]]
* ↓ [[Spirometry|FEV1]]
* ↑ [[FEV1/FVC ratio|FEV1/FVC]]
* ↓ [[DLCO]]
|
* ↓ [[Oxygen|O2]]
* ↓ CO2
* [[Respiratory acidosis]]
|
* [[Lymphocytosis]] 
* Elevated [[adenosine deaminase]]
* [[D-dimer]] +
|
* Clinical evaluation and investigations
|-
! rowspan="2" style="background:#DCDCDC;" align="center" |Granulomatous vasculitides
! style="background:#DCDCDC;" align="center" |Granulomatosis with polyangiitis (Wegener)<ref name="pmid26684637">{{cite journal |vauthors=Greco A, Marinelli C, Fusconi M, Macri GF, Gallo A, De Virgilio A, Zambetti G, de Vincentiis M |title=Clinic manifestations in granulomatosis with polyangiitis |journal=Int J Immunopathol Pharmacol |volume=29 |issue=2 |pages=151–9 |date=June 2016 |pmid=26684637 |pmc=5806708 |doi=10.1177/0394632015617063 |url=}}</ref>
| align="center" |Chronic
| align="center" |Elderly
| align="center" |Both
| align="center" | +
| align="center" | −
| align="center" | −
| align="center" | −
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" |±
| align="center" | −
|
* [[Rales|Crackles]]
| align="center" | −
| align="center" | −
|
* [[Anti-neutrophil cytoplasmic antibody|ANCA]] +
* [[Anemia]]
* [[Leukocytosis]]
* [[Thrombocytosis]]
* Elevated [[Erythrocyte sedimentation rate|ESR]]
* Elevated [[C-reactive protein|CRP]]
* Elevated [[creatinine]]
* Urine [[protein]] +
* [[Hematuria]] 
|
* Cavitate [[Nodule (medicine)|nodules]]
* Ground−glass opacity
* [[Consolidation (medicine)|Consolidation]]
* [[Pleural effusion]]
* [[Hilar lymphadenopathy|Hilar adenopathy]]
|
* ↓ [[FEV1/FVC ratio|FEV1/FVC]]
|
* ↓ [[Oxygen|O2]]
|
* Alveolar hemorrhage
|
* Lung [[biopsy]]
|-
! style="background:#DCDCDC;" align="center" |[[Eosinophilic granulomatosis with polyangiitis]] (Churg Strauss)<ref name="pmid25500434">{{cite journal |vauthors=Greco A, Rizzo MI, De Virgilio A, Gallo A, Fusconi M, Ruoppolo G, Altissimi G, De Vincentiis M |title=Churg-Strauss syndrome |journal=Autoimmun Rev |volume=14 |issue=4 |pages=341–8 |date=April 2015 |pmid=25500434 |doi=10.1016/j.autrev.2014.12.004 |url=}}</ref>
| align="center" |Chronic
| align="center" |40−50 years old
| align="center" |Both
| align="center" | +
| align="center" | −
| align="center" | −
| align="center" | −
| align="center" | −
| align="center" | +
| align="center" | +
| align="center" | −
| align="center" | −
|
* Scattered [[Wheeze|wheezing]]
| align="center" | −
| align="center" | −
|
* [[Eosinophilia]]
* Elevated [[Immunoglobulin E|IgE]] titers
* [[Anti-neutrophil cytoplasmic antibody|ANCA]] +
|
* Areas of parenchymal opacification
* Mixed interstitial patchy [[Alveolus|alveolar]] opacities
|
* ↓ [[Lung volumes|TLC]]
 
* ↑ [[Residual volume|RV]]
|
* Normal
|
* [[Eosinophilia]] 
|
* Lung [[biopsy]]
|-
! colspan="2" style="background:#DCDCDC;" align="center" |Bronchocentric granulomatosis<ref name="Myers1989">{{cite journal|last1=Myers|first1=Jeffrey L.|title=Bronchocentric Granulomatosis|journal=Chest|volume=96|issue=1|year=1989|pages=3–4|issn=00123692|doi=10.1378/chest.96.1.3}}</ref>
| align="center" |Chronic
| align="center" |30−70 years old
| align="center" |Both
| align="center" | −
| align="center" |−
| align="center" |−
| align="center" |−
| align="center" |±
| align="center" |±
| align="center" | +
| align="center" |±
| align="center" | −
|
* Scattered [[Wheeze|wheezing]]
| align="center" | −
| align="center" |−
|
* [[Eosinophilia]]
* Elevated [[Immunoglobulin E|IgE]] titers
* Elevated circulating IgE antibodies to [[Aspergillus]] species
|
* Upper zone single or multiple pulmonary [[Nodule (medicine)|nodules]] 
* [[Consolidation (medicine)|Consolidation]]
* [[Atelectasis]]
|
* ↓ [[FEV1/FVC ratio|FEV1/FVC]]
|
* Normal
|
* [[Eosinophilia]] 
|
* Lung [[biopsy]]
|-
! colspan="2" style="background:#DCDCDC;" align="center" |Pulmonary lymphomatoid granulomatosis<ref name="AnkitaShashi2016">{{cite journal|last1=Ankita|first1=Grover|last2=Shashi|first2=Dhawan|title=Pulmonary Lymphomatoid Granulomatosis- a Case Report with Review of Literature|journal=Indian Journal of Surgical Oncology|volume=7|issue=4|year=2016|pages=484–487|issn=0975-7651|doi=10.1007/s13193-016-0525-1}}</ref>
| align="center" |Chronic
| align="center" |30−50 years old
| align="center" |Male
| align="center" | −
| align="center" |−
| align="center" |−
| align="center" |−
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" | +
| align="center" |−
|
* Normal
| align="center" |−
| align="center" |−
|
* [[Epstein Barr virus|Epstein-Barr virus]] (EBV) serology +
|
* Mid to lower zone multiple poorly defined [[Nodule (medicine)|nodules]]
* Diffuse reticular abnormalities
|
* Normal
|
* ↓ [[Oxygen|O2]]
* Chronic [[respiratory alkalosis]]
|
* Normal
|
* Lung [[biopsy]]
|-
! colspan="2" style="background:#DCDCDC;" align="center" |[[Amyloidosis]]<ref name="KhoorColby2017">{{cite journal|last1=Khoor|first1=Andras|last2=Colby|first2=Thomas V.|title=Amyloidosis of the Lung|journal=Archives of Pathology & Laboratory Medicine|volume=141|issue=2|year=2017|pages=247–254|issn=0003-9985|doi=10.5858/arpa.2016-0102-RA}}</ref><ref name="MilaniBasset2017">{{cite journal|last1=Milani|first1=Paolo|last2=Basset|first2=Marco|last3=Russo|first3=Francesca|last4=Foli|first4=Andrea|last5=Palladini|first5=Giovanni|last6=Merlini|first6=Giampaolo|title=The lung in amyloidosis|journal=European Respiratory Review|volume=26|issue=145|year=2017|pages=170046|issn=0905-9180|doi=10.1183/16000617.0046-2017}}</ref>
| align="center" |Subacute/chronic
| align="center" |50−70 years old
| align="center" |Male
| align="center" | +
| align="center" | −
| align="center" | −
| align="center" | −
| align="center" | −
| align="center" | Bloody
| align="center" | +
| align="center" | −
| align="center" | −
|
* [[Rales|Crackles]]
| align="center" | −
| align="center" | −
|
* Congophilia with apple−green birefringence under polarized light
|
* Tracheobronchial infiltration
* Persistent [[Pleural effusion|pleural effusions]]
* Parenchymal [[Nodule (medicine)|nodules]]
|
* ↓ [[FEV1/FVC ratio|FEV1/FVC]]
|
* ↓ [[Oxygen|O2]]
|
* Normal
|
* Lung [[biopsy]]
|-
! colspan="2" rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Disease
! colspan="7" style="background:#4479BA; color: #FFFFFF;" align="center" |History
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Symptoms
! colspan="4" style="background:#4479BA; color: #FFFFFF;" align="center" |Physical examination
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Lab findings
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Imaging
! colspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Pulmonary function test
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Bronchoscopy and BAL
! rowspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Gold standard
|-
! style="background:#4479BA; color: #FFFFFF;" align="center" |Duration
! style="background:#4479BA; color: #FFFFFF;" align="center" |Age
! style="background:#4479BA; color: #FFFFFF;" align="center" |Gender
! style="background:#4479BA; color: #FFFFFF;" align="center" |Family history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Smoking history
! style="background:#4479BA; color: #FFFFFF;" align="center" |Environmental exposure
! style="background:#4479BA; color: #FFFFFF;" align="center" |HIV
! style="background:#4479BA; color: #FFFFFF;" align="center" |Dyspnea
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cough
! style="background:#4479BA; color: #FFFFFF;" align="center" |Wheezing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Chest pain
! style="background:#4479BA; color: #FFFFFF;" align="center" |Tachypnea  
! style="background:#4479BA; color: #FFFFFF;" align="center" |Auscultation
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cyanosis
! style="background:#4479BA; color: #FFFFFF;" align="center" |Clubbing
! style="background:#4479BA; color: #FFFFFF;" align="center" |Spirometry
! style="background:#4479BA; color: #FFFFFF;" align="center" |ABG
|}
</small></small>
 
== Laboratory Finidngs ==
There are multiple laboratory tests that may be helpful to ascertain or rule out the diagnosis of interstitial lung disease.
{| class="wikitable"
! style="background:#4479BA; color: #FFFFFF;" align="center" |Condition
! style="background:#4479BA; color: #FFFFFF;" align="center" |Disease
! colspan="2" style="background:#4479BA; color: #FFFFFF;" align="center" |Investigation
|-
| colspan="2" rowspan="7" |All patients with suspicious interstitial lung disease
| colspan="2" |[[Complete blood count]] and differential
|-
| rowspan="3" |[[Liver function tests]]
|[[Alanine transaminase|Alanine aminotransferase]] (ALT, SGPT)
|-
|[[Aspartate transaminase|Aspartate aminotransferase]] (AST, SGOT)
|-
|[[Alkaline phosphatase]]
|-
| rowspan="3" |[[Renal function tests]]
|[[Urine|Urinalysis]]
|-
|[[Blood urea nitrogen]] (BUN)
|-
|[[Creatinine]] (Cr)
|-
| rowspan="7" |Suspicious of systemic [[rheumatic disease]]
|[[Rheumatoid arthritis|RA]]
|[[Serology]]
|[[Anti-citrullinated protein antibody|Anti−cyclic citrullinated peptide]] (Anti-CCP)
|-
|[[SLE]]
|[[Serology]]
|[[Anti-dsDNA antibody|Anti−double stranded DNA antibodies]] (Anti-dsDNA antibody)
|-
|[[Dermatomyositis|Amyopathic dermatomyositis]]
|[[Serology]]
|Anti-melanoma differentiation-associated gene 5 (MDA-5)
|-
| rowspan="4" |Nonspecific
|[[Serology]]
|[[Anti-nuclear antibody|Antinuclear antibody]] (ANA)
|-
|[[Serology]]
|[[Rheumatoid factor]] (RF)
|-
|[[Serology]]
|[[Anti-neutrophil cytoplasmic antibody]] (ANCA)
|-
|[[Enzyme]]
|[[Creatine kinase]] (CK), [[aldolase]]
|-
| rowspan="3" |Mechanic hands
| rowspan="3" |[[Myositis]]
| rowspan="3" |Myositis−associated antibodies
|Anti-tRNA synthetases Jo-1
|-
|Anti-tRNA synthetases PL-7
|-
|Anti-tRNA synthetases PL-12
|-
| rowspan="4" |[[Sicca syndrome|Sicca]] features or positive anti−extractable nuclear antigen (ENA)
| rowspan="2" |[[Sjögren's syndrome|Sjögren’s syndrome]]
|[[Serology]]
|Anti-RO (SS−A)
|-
|[[Serology]]
|Anti-La (SS−B)
|-
|[[Mixed connective tissue disease]] 
|[[Serology]]
|Anti-ribonucleoprotein (RNP)
|-
|IgG4-related disease
|[[Serology]]
|Serum IgG4
|-
| rowspan="2" |Severe GERD or sclerodactyly
|Limited systemic [[scleroderma]]
|[[Serology]]
|Anti-centromere
|-
|Systemic [[scleroderma]]
|[[Serology]]
|Anti-topoisomerase I (anti-Scl-70)
|-
| rowspan="2" |Dyspnea
|Heart failure
| rowspan="2" |[[Enzyme]]
|[[Brain natriuretic peptide]] (BNP)
|-
|[[Pulmonary hypertension]]
|N-terminal proBNP (NT-proBNP)
|-
| rowspan="4" |[[Anemia]] and/or [[hemoptysis]]
|[[Coagulopathy|Coagulopathies]]
| colspan="2" |[[Coagulation|Coagulation studies]]
|-
|[[Goodpasture syndrome]]
|[[Serology]]
|Anti−glomerular basement membrane (GBM) antibodies
|-
|[[Antiphospholipid syndrome]]
|[[Serology]]
|[[Antiphospholipid antibodies]]
|-
|Idiopathic pulmonary hemosiderosis
|[[Serology]]
|Serum IgA endomysial or tissue transglutaminase antibodies 
|-
|Mediastinal lymphadenopathy
|[[Multiple myeloma]]
| colspan="2" |Serum protein electrophoresis
|-
|Beryllium exposure
|[[Berylliosis]]
| colspan="2" |Peripheral blood beryllium lymphocyte proliferation test
|-
| rowspan="2" |Risk factors for HIV
| rowspan="2" |[[HIV]]
| colspan="2" |[[ELISA]]
|-
| colspan="2" |Western blot test
|}
 
== Occupational Lung Disease ==
* [[Occupational lung disease|Occupational lung diseases]] are caused by the accumulation of different dust particles in the [[Alveolus|alveolar]] space.<ref name="pmid10931786">{{cite journal| author=Castranova V, Vallyathan V| title=Silicosis and coal workers' pneumoconiosis. | journal=Environ Health Perspect | year= 2000 | volume= 108 Suppl 4 | issue= | pages= 675-84 | pmid=10931786 | doi= | pmc=PMC1637684 | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=10931786  }} </ref>
* As the particles accumulate, the elimination mechanisms of the body begin to fail, resulting in activation of [[Chemotaxis|chemotactic]] factors that exacerbate the [[Inflammation|inflammatory]] response, and subsequently lead to [[fibrosis]]. 
* The most common particles that cause [[pneumoconiosis]] are [[asbestos]], [[silica]], coal, magnesium silicate, aluminum silicate, [[bauxite]], [[cobalt]], [[beryllium]] and [[iron]].
'''For more information about occupational lung disease, [[Occupational lung disease|click here]].'''


==[[Interstitial lung disease historical perspective|Historical Perspective]]==
== Drug-induced lung injury==
More than 600 medications have [[Pulmonary toxicity|pulmonary toxicity]] and may cause [[lung]] injury.<ref name="CamusBonniaud2004">{{cite journal|last1=Camus|first1=Philippe|last2=Bonniaud|first2=Philippe|last3=Fanton|first3=Annlyse|last4=Camus|first4=Clio|last5=Baudaun|first5=Nicolas|last6=Foucher|first6=Pascal|title=Drug-induced and iatrogenic infiltrative lung disease|journal=Clinics in Chest Medicine|volume=25|issue=3|year=2004|pages=479–519|issn=02725231|doi=10.1016/j.ccm.2004.05.006}}</ref>
* [[Lung]] injury following medication intake might vary from interstitial lung disease to [[hypersensitivity pneumonitis]], [[pleural effusion]] or [[pulmonary edema]].<ref name="pmid8484641">{{cite journal |vauthors=Todd NW, Peters WP, Ost AH, Roggli VL, Piantadosi CA |title=Pulmonary drug toxicity in patients with primary breast cancer treated with high-dose combination chemotherapy and autologous bone marrow transplantation |journal=Am. Rev. Respir. Dis. |volume=147 |issue=5 |pages=1264–70 |date=May 1993 |pmid=8484641 |doi=10.1164/ajrccm/147.5.1264 |url=}}</ref><ref name="pmid15062605">{{cite journal |vauthors=Schwarz MI, Fontenot AP |title=Drug-induced diffuse alveolar hemorrhage syndromes and vasculitis |journal=Clin. Chest Med. |volume=25 |issue=1 |pages=133–40 |date=March 2004 |pmid=15062605 |doi=10.1016/S0272-5231(03)00139-4 |url=}}</ref>
* The presentation of [[lung]] injury might be acute, subacute or chronic and it might occur weeks to years even after discontinuing the drug.<ref name="pmid9493644">{{cite journal |vauthors=De Vuyst P, Pfitzenmeyer P, Camus P |title=Asbestos, ergot drugs and the pleura |journal=Eur. Respir. J. |volume=10 |issue=12 |pages=2695–8 |date=December 1997 |pmid=9493644 |doi= |url=}}</ref><ref name="pmid20592596">{{cite journal |vauthors=Wijnen PA, Bekers O, Drent M |title=Relationship between drug-induced interstitial lung diseases and cytochrome P450 polymorphisms |journal=Curr Opin Pulm Med |volume=16 |issue=5 |pages=496–502 |date=September 2010 |pmid=20592596 |doi=10.1097/MCP.0b013e32833c06f1 |url=}}</ref>
* Diagnosis of drug-induced lung injury is by the exclusion of other diseases. Detailed history and paraclinical [[Lung|pulmonary]] investigations are required to exclude other causes of interstitial lung disease. [[Lung|Pulmonary]] investigations are as follow:<ref name="Matsuno2012">{{cite journal|last1=Matsuno|first1=Osamu|title=Drug-induced interstitial lung disease: mechanisms and best diagnostic approaches|journal=Respiratory Research|volume=13|issue=1|year=2012|pages=39|issn=1465-9921|doi=10.1186/1465-9921-13-39}}</ref>
** [[Restrictive lung disease|Restrictive pattern]] on [[Spirometry|pulmonary function tests]] ([[Spirometry|PFTs]])
** [[FEV1/FVC ratio]] normal or increased
** Reduced [[DLCO]]
** [[Bronchoalveolar lavage]] may exclude [[Infection|infectious]] disease
** [[Bronchoscopy]] with transbronchial [[biopsy]] may be indicated to exclude other [[Lung|pulmonary]] diseases
** Invasive lung [[biopsy]] rarely required
* Management of drug-induced lung injury includes:<ref name="pmid205227932">{{cite journal |vauthors=Gingo MR, George MP, Kessinger CJ, Lucht L, Rissler B, Weinman R, Slivka WA, McMahon DK, Wenzel SE, Sciurba FC, Morris A |title=Pulmonary function abnormalities in HIV-infected patients during the current antiretroviral therapy era |journal=Am. J. Respir. Crit. Care Med. |volume=182 |issue=6 |pages=790–6 |date=September 2010 |pmid=20522793 |pmc=2949404 |doi=10.1164/rccm.200912-1858OC |url=}}</ref>
** Immediate drug discontinuation
** Supportive therapy
** Control of other underlying chronic [[Pulmonology|pulmonary disease]]
** Treatment of [[Respiratory tract infection|respiratory infections]]
** [[Smoking cessation]]
** [[Glucocorticoid]] therapy<ref name="pmid7842781">{{cite journal |vauthors=Kalaycioglu M, Kavuru M, Tuason L, Bolwell B |title=Empiric prednisone therapy for pulmonary toxic reaction after high-dose chemotherapy containing carmustine (BCNU) |journal=Chest |volume=107 |issue=2 |pages=482–7 |date=February 1995 |pmid=7842781 |doi= |url=}}</ref>
* List of medications that might cause interstitial lung disease is as follow:<ref name="Schwaiblmair2012">{{cite journal|last1=Schwaiblmair|first1=Martin|title=Drug Induced Interstitial Lung Disease|journal=The Open Respiratory Medicine Journal|volume=6|issue=1|year=2012|pages=63–74|issn=18743064|doi=10.2174/1874306401206010063}}</ref><ref name="pmid25546981">{{cite journal |vauthors=Vasić NR, Milenković BA, Pešut DP, Stević RS, Jovanović DM |title=Drug induced lung disease--amiodarone in focus |journal=Med. Pregl. |volume=67 |issue=9-10 |pages=334–7 |date=2014 |pmid=25546981 |doi= |url=}}</ref>
{| class="wikitable"
! colspan="7" style="background:#4479BA; color: #FFFFFF;" align="center" |Drug−induced lung injury
|-
! style="background:#4479BA; color: #FFFFFF;" align="center" |Antimicrobial Agents
! style="background:#4479BA; color: #FFFFFF;" align="center" |Anti−Inflammatory Agents
! style="background:#4479BA; color: #FFFFFF;" align="center" |Biological Agents
! style="background:#4479BA; color: #FFFFFF;" align="center" |Cardiovascular Agents
! style="background:#4479BA; color: #FFFFFF;" align="center" |Immunomodulator agents
! style="background:#4479BA; color: #FFFFFF;" align="center" |Antineoplastic agents
! style="background:#4479BA; color: #FFFFFF;" align="center" |Miscellaneous
|- valign="top"
|
* [[Amphotericin B]]
* [[Doripenem]]
* [[Ethambutol]]
* [[Isoniazid]]
* [[Minocycline]]
* [[Nitrofurantoin]]
* [[Sulfasalazine]]
|
* [[Abatacept]] 
* [[Aspirin]]
* [[Azathioprine]]
* [[Cyclophosphamide]]
* [[Gold]]
* [[Anakinra]]
* [[Leflunomide]]
* [[Methotrexate]]
* [[Non-steroidal anti-inflammatory drug|Nonsteroidal anti-inflammatory drugs]]
* [[Penicillamine]]
* [[Sulfasalazine]]
* [[Thalidomide]]
|
* [[Adalimumab]]
* [[Alemtuzumab]]
* [[Interferon type I|Alpha interferon]]
* [[Bevacizumab]]
* [[Cetuximab]]
* [[Etanercept]] 
* [[Infliximab]]
* [[Panitumumab]]
* [[Rituximab]]
* [[Tocilizumab]]
* [[Trastuzumab]]
|
* [[ACE inhibitor|ACE inhibitors]]
* [[Amiodarone]]<ref name="pmid19399307">{{cite journal |vauthors=Wolkove N, Baltzan M |title=Amiodarone pulmonary toxicity |journal=Can. Respir. J. |volume=16 |issue=2 |pages=43–8 |date=2009 |pmid=19399307 |pmc=2687560 |doi= |url=}}</ref>
* [[Anticoagulant|Anticoagulants]]
* [[Beta blockers]]
* [[Flecainide]]
* [[Hydrochlorothiazide]]
* [[Procainamide]]
* [[Statins]]<ref name="FernándezKaras2008">{{cite journal|last1=Fernández|first1=Antonio B.|last2=Karas|first2=Richard H.|last3=Alsheikh-Ali|first3=Alawi A.|last4=Thompson|first4=Paul D.|title=Statins and Interstitial Lung Disease|journal=Chest|volume=134|issue=4|year=2008|pages=824–830|issn=00123692|doi=10.1378/chest.08-0943}}</ref>
* [[Tocainide]]
|
* [[Sirolimus]]
* [[Riluzole]]
* [[Trametinib]]
* [[vandetanib]]
|
<div style="-moz-column-count:2; column-count:2;">
* [[Azathioprine]]
* [[Bleomycin]]
* [[Bortezomib]]
* [[Busulfan]]
* [[Carmustine]] (BCNU)<ref name="pmid2370889">{{cite journal |vauthors=O'Driscoll BR, Hasleton PS, Taylor PM, Poulter LW, Gattameneni HR, Woodcock AA |title=Active lung fibrosis up to 17 years after chemotherapy with carmustine (BCNU) in childhood |journal=N. Engl. J. Med. |volume=323 |issue=6 |pages=378–82 |date=August 1990 |pmid=2370889 |doi=10.1056/NEJM199008093230604 |url=}}</ref>
* [[Chlorambucil]]
* [[Colony-stimulating factor|Colony-stimulating factors]]
* [[Crizotinib]]
* [[Cyclophosphamide]]<ref name="pmid84846412">{{cite journal |vauthors=Todd NW, Peters WP, Ost AH, Roggli VL, Piantadosi CA |title=Pulmonary drug toxicity in patients with primary breast cancer treated with high-dose combination chemotherapy and autologous bone marrow transplantation |journal=Am. Rev. Respir. Dis. |volume=147 |issue=5 |pages=1264–70 |date=May 1993 |pmid=8484641 |doi=10.1164/ajrccm/147.5.1264 |url=}}</ref>
* [[Cytarabine]]
* [[Deferoxamine]]
* [[Docetaxel]]
* [[Doxorubicin hydrochloride|Doxorubicin]]
* [[Eribulin]]
* [[Erlotinib]]
* [[Etoposide]] (VP−16)
* [[Fludarabine]]
* [[Flutamide]]
* [[Gefitinib]]
* [[Gemcitabine]]<ref name="pmid23404815">{{cite journal |vauthors=Tamura M, Saraya T, Fujiwara M, Hiraoka S, Yokoyama T, Yano K, Ishii H, Furuse J, Goya T, Takizawa H, Goto H |title=High-resolution computed tomography findings for patients with drug-induced pulmonary toxicity, with special reference to hypersensitivity pneumonitis-like patterns in gemcitabine-induced cases |journal=Oncologist |volume=18 |issue=4 |pages=454–9 |date=2013 |pmid=23404815 |pmc=3639533 |doi=10.1634/theoncologist.2012-0248 |url=}}</ref>
* [[Hydroxyurea]]
* [[Imatinib]]
* [[Lomustine]] (CCNU)
* [[Melphalan]]
* [[Mitomycin (patient information)|Mitomycin-C]]
* [[Nilutamide]]
* [[Nitrosourea]]
* [[Olsalazine]]
* [[Paclitaxel]]
* [[Procarbazine]]
* [[Semustine]] (Methyl−CCNU)
* [[Sorafenib]]
* [[Vinblastine]]
|
* [[BCG vaccine|Bacille Calmette-Guerin]] (BCG)
* [[Bromocriptine]]
* [[Carbamazepine]]
* [[Cabergoline]]
* [[Cocaine]]<ref name="pmid22934773">{{cite journal |vauthors=Drent M, Wijnen P, Bast A |title=Interstitial lung damage due to cocaine abuse: pathogenesis, pharmacogenomics and therapy |journal=Curr. Med. Chem. |volume=19 |issue=33 |pages=5607–11 |date=2012 |pmid=22934773 |doi= |url=}}</ref>
* [[Methysergide]]
* [[Tryptophan|L-tryptophan]]
* [[Penicillamine]]
* [[Phenytoin]]
* [[Talcosis|Talc]]
|}


==[[Interstitial lung disease pathophysiology|Pathophysiology]]==
== Radiation-induced Lung Injury ==
[[Radiation therapy|Radiation]] has been considered as one of the causes of [[lung]] injury. About 5 to 15% of patients receiving [[radiation therapy]] may present with [[Lung|pulmonary]] symptoms.<ref name="MalaviyaGow2015">{{cite journal|last1=Malaviya|first1=Rama|last2=Gow|first2=Andrew J.|last3=Francis|first3=Mary|last4=Abramova|first4=Elena V.|last5=Laskin|first5=Jeffrey D.|last6=Laskin|first6=Debra L.|title=Radiation-Induced Lung Injury and Inflammation in Mice: Role of Inducible Nitric Oxide Synthase and Surfactant Protein D|journal=Toxicological Sciences|volume=144|issue=1|year=2015|pages=27–38|issn=1096-0929|doi=10.1093/toxsci/kfu255}}</ref>
* [[Lung|Pulmonary]] injury following [[irradiation]] is directly related to duration and dose of [[Radiation therapy|radiation]].<ref name="pmid16015535">{{cite journal |vauthors=Kong FM, Ten Haken R, Eisbruch A, Lawrence TS |title=Non-small cell lung cancer therapy-related pulmonary toxicity: an update on radiation pneumonitis and fibrosis |journal=Semin. Oncol. |volume=32 |issue=2 Suppl 3 |pages=S42–54 |date=April 2005 |pmid=16015535 |doi= |url=}}</ref>
* The main pathogenesis of radiation-induced lung injury is the damage to the type I [[Pneumocyte|pneumocytes]] which triggers the initiation of reactions. It leads to secretion of [[Growth factor|growth factors]] and [[Protease|proteases]] which increases degradation of [[extracellular matrix]]. Also, radiation causes damage to [[Epithelium|epithelial cells]] which leads to loss of barrier function. All of these changes cause a cycle of [[inflammation]] and [[fibrosis]].<ref name="pmid25854336">{{cite journal |vauthors=Giridhar P, Mallick S, Rath GK, Julka PK |title=Radiation induced lung injury: prediction, assessment and management |journal=Asian Pac. J. Cancer Prev. |volume=16 |issue=7 |pages=2613–7 |date=2015 |pmid=25854336 |doi= |url=}}</ref>
* There are two types of reaction in [[Lung|pulmonary]] tissues to [[Radiation therapy|radiation]] which include:<ref name="pmid17126203">{{cite journal |vauthors=Tsoutsou PG, Koukourakis MI |title=Radiation pneumonitis and fibrosis: mechanisms underlying its pathogenesis and implications for future research |journal=Int. J. Radiat. Oncol. Biol. Phys. |volume=66 |issue=5 |pages=1281–93 |date=December 2006 |pmid=17126203 |doi=10.1016/j.ijrobp.2006.08.058 |url=}}</ref>
** Early [[Lung|pulmonary]] reaction:
*** It usually occurs in 4 to 12 weeks following [[irradiation]].
*** Early reaction mostly presents as radiation [[pneumonitis]].
*** Treatment of radiation [[pneumonitis]] include [[Steroid|steroids]], [[ACE inhibitor|ACE inhibitors]] and [[pentoxifylline]].
** Late [[Lung|pulmonary]] reaction:
*** It usually occurs 6 to 12 months following [[irradiation]].
*** Late response usually induces lung [[fibrosis]].
*** Management of lung [[fibrosis]] consists of supportive therapy, [[airway]] secretions mobilization, anti-inflammatory therapy, and management of acute exacerbations.
* [[Computed tomography|CT]] might be used for the diagnosis of radiation [[pneumonitis]]. Ground glass opacities, [[Consolidation (medicine)|consolidation]], [[fibrosis]], [[atelectasis]], pulmonary volume loss, or [[Pleural cavity|pleural]] thickening might be seen on [[Computed tomography|CT scan]].


==[[Interstitial lung disease causes|Causes]]==
== Smoking related Interstitial Lung Disease ==
[[Smoking|Cigarette smoking]] may cause various adverse effects on [[Lung|pulmonary]] tissue.<ref>{{cite journal |last=Nagai |first=Sonoko |coauthors=Yuma Hoshino, Michio Hayashi, Isao Ito |title=Smoking-related interstitial lung diseases |url=http://www.co-pulmonarymedicine.com/pt/re/copulmonary/abstract.00063198-200009000-00005.htm |journal=Current Opinion in Pulmonary Medicine |volume=6 |issue=5 |pages=415-9 |year=2000 |pmid=10958232}}</ref><ref>{{cite journal |last=Baumgartner |first=KB |coauthors=Samet JM, Stidley CA, Colby TV, Waldron JA |title=Cigarette smoking: a risk factor for idiopathic pulmonary fibrosis |url= http://ajrccm.atsjournals.org/cgi/content/short/155/1/242 |journal=American Journal of Respiratory and Critical Care Medicine |volume=155 |number=1 |pages=242-248 |year=1997 |pmid=9001319}}</ref><ref name="pmid29222007">{{cite journal |vauthors=Kumar A, Cherian SV, Vassallo R, Yi ES, Ryu JH |title=Current Concepts in Pathogenesis, Diagnosis, and Management of Smoking-Related Interstitial Lung Diseases |journal=Chest |volume= |issue= |pages= |date=December 2017 |pmid=29222007 |doi=10.1016/j.chest.2017.11.023 |url=}}</ref>
* [[Smoking|Cigarette smoke]] might injure [[Alveolus|alveolar]] [[Epithelium|epithelial cells]] leading to in diffuse [[Infiltration (medical)|infiltration]] and subsequently [[Parenchyma|parenchymal]] [[fibrosis]].
* Alveolar [[Epithelium|epithelial cells]] are the primary [[Cell (biology)|cells]] involved in the pathogenesis of [[emphysema]] as well as lung [[fibrosis]] following [[smoking]].
* [[Smoking|Cigarette smoking]] may predispose alveolar [[Epithelium|epithelial cells]] to cellular [[senescence]] and [[apoptosis]] that leads to [[emphysema]] or lung [[fibrosis]].
* A well-known association exists between [[tobacco smoking]] and some types of interstitial lung disease such as: 
** Desquamative interstitial pneumonia
** Respiratory bronchiolitis-associated [[interstitial lung disease]]
** Pulmonary [[Langerhans cell histiocytosis|Langerhans cell granulomatosis]]
** Acute [[eosinophilic pneumonia]]


==[[Interstitial lung disease differential diagnosis|Differentiating Interstitial lung disease from other Diseases]]==
== Idiopathic Interstitial Pneumonia ==
The idiopathic interstitial pneumonias (IIP) are a broad range of interstitial lung diseases of unknown etiology.<ref name="Selman">{{cite journal |last=Selman |first=Moisés |coauthors=Talmadge E. King, Jr.; and Annie Pardo |title=Idiopathic pulmonary fibrosis: prevailing and evolving hypotheses about its pathogenesis and implications for therapy |journal=Annals of Internal Medicine |year=2001 |volume=134 |number=2 |pages=136-51|url=http://www.annals.org/cgi/content/abstract/134/2/136}}</ref><ref>{{cite journal |last=King, Jr. |first=Talmadge E. |title=Centennial review: clinical advances in the diagnosis and therapy of the interstitial lung diseases|url=http://ajrccm.atsjournals.org/cgi/content/full/172/3/268 |journal=American Journal of Respiratory and Critical Care Medicine |year=2005 |volume=172 |number=3 |pages=268-79}}</ref><ref name="Flaherty-2001">{{Cite journal | last1 = Flaherty | first1 = KR. | last2 = Travis | first2 = WD. | last3 = Colby | first3 = TV. | last4 = Toews | first4 = GB. | last5 = Kazerooni | first5 = EA. | last6 = Gross | first6 = BH. | last7 = Jain | first7 = A. | last8 = Strawderman | first8 = RL. | last9 = Flint | first9 = A. | title = Histopathologic variability in usual and nonspecific interstitial pneumonias. | journal = Am J Respir Crit Care Med | volume = 164 | issue = 9 | pages = 1722-7 | month = Nov | year = 2001 | doi = 10.1164/ajrccm.164.9.2103074 | PMID = 11719316 }}</ref><ref name="Cottin-1998">{{Cite journal | last1 = Cottin | first1 = V. | last2 = Donsbeck | first2 = AV. | last3 = Revel | first3 = D. | last4 = Loire | first4 = R. | last5 = Cordier | first5 = JF. | title = Nonspecific interstitial pneumonia. Individualization of a clinicopathologic entity in a series of 12 patients. | journal = Am J Respir Crit Care Med | volume = 158 | issue = 4 | pages = 1286-93 | month = Oct | year = 1998 | doi = 10.1164/ajrccm.158.4.9802119 | PMID = 9769293 }}</ref><ref name="Park-1996">{{Cite journal | last1 = Park | first1 = CS. | last2 = Jeon | first2 = JW. | last3 = Park | first3 = SW. | last4 = Lim | first4 = GI. | last5 = Jeong | first5 = SH. | last6 = Uh | first6 = ST. | last7 = Park | first7 = JS. | last8 = Choi | first8 = DL. | last9 = Jin | first9 = SY. | title = Nonspecific interstitial pneumonia/fibrosis: clinical manifestations, histologic and radiologic features. | journal = Korean J Intern Med | volume = 11 | issue = 2 | pages = 122-32 | month = Jun| year = 1996 | doi = | PMID = 8854648 }}</ref><ref name="Shimizu-2002">{{Cite journal | last1 = Shimizu | first1 = S. | last2 = Yoshinouchi | first2 = T. | last3 = Ohtsuki | first3 = Y. | last4 = Fujita | first4 = J. |last5 = Sugiura | first5 = Y. | last6 = Banno | first6 = S. | last7 = Yamadori | first7 = I. | last8 = Eimoto | first8 = T. | last9 = Ueda | first9 = R. | title = The appearance of S-100 protein-positive dendritic cells and the distribution of lymphocyte subsets in idiopathic nonspecific interstitial pneumonia. | journal = Respir Med | volume = 96 | issue = 10 | pages = 770-6 | month = Oct | year = 2002 | doi = | PMID = 12412975 }}</ref>
*Pathogenesis of idiopathic interstitial pneumonia is [[Fibroblast|fibroblasts]] proliferation and [[collagen]] deposition leading to [[inflammation]] and [[fibrosis]].
*Patients with idiopathic interstitial pneumonia generally manifest as a gradual [[dyspnea]] and dry [[cough]].
*On chest imaging it is characterized by bilateral abnormal opacities of various types.
*The most common type of idiopathic interstitial pneumonia is chronic [[idiopathic pulmonary fibrosis]]. However, [[Hamman-Rich syndrome|acute interstitial pneumonia]] has the worst prognosis.
*The exact [[diagnosis]] can only be reached with a multidisciplinary approach after excluding known causes.
*The new classification of idiopathic interstitial pneumonias is as follow:
** Major idiopathic interstitial pneumonias
*** [[Idiopathic pulmonary fibrosis]]
*** Idiopathic nonspecific interstitial pneumonia
*** [[Respiratory bronchiolitis-interstitial lung disease]]
*** [[Desquamative interstitial pneumonia]]
*** [[Cryptogenic organizing pneumonia]]
*** [[Hamman-Rich syndrome|Acute interstitial pneumonia]]
** Rare idiopathic interstitial pneumonias
*** Idiopathic [[lymphoid interstitial pneumonia]]
*** Idiopathic pleuroparenchymal fibroelastosis
** Unclassifiable idiopathic interstitial pneumonias


==[[Interstitial lung disease epidemiology and demographics|Epidemiology and Demographics]]==
'''For more information about Idiopathic interstitial pneumonia, [[Idiopathic interstitial pneumonia|click here]].'''


==[[Interstitial lung disease risk factors|Risk Factors]]==
'''For more information about idiopathic pulmonary fibrosis, [[Idiopathic pulmonary fibrosis|click here]].'''


==[[Interstitial lung disease natural history, complications and prognosis|Natural History, Complications and Prognosis]]==
'''For more information about Cryptogenic organizing pneumonia, [[Cryptogenic organizing pneumonia|click here]].'''


==Diagnosis==
== Pulmonary Alveolar Proteinosis ==
[[Pulmonary alveolar proteinosis]] (PAP) is a rare lung disease that is characterized by the intra-alveolar accumulation of [[Pulmonary surfactant|surfactant]] phospholipid and [[apoproteins]].<ref name="pmid25864717">{{cite journal |vauthors=Papiris SA, Tsirigotis P, Kolilekas L, Papadaki G, Papaioannou AI, Triantafillidou C, Papaporfyriou A, Karakatsani A, Kagouridis K, Griese M, Manali ED |title=Pulmonary alveolar proteinosis: time to shift? |journal=Expert Rev Respir Med |volume=9 |issue=3 |pages=337–49 |date=June 2015 |pmid=25864717 |doi=10.1586/17476348.2015.1035259 |url=}}</ref><ref name="pmid27514590">{{cite journal |vauthors=Suzuki T, Trapnell BC |title=Pulmonary Alveolar Proteinosis Syndrome |journal=Clin. Chest Med. |volume=37 |issue=3 |pages=431–40 |date=September 2016 |pmid=27514590 |doi=10.1016/j.ccm.2016.04.006 |url=}}</ref>
* The exact etiology of [[pulmonary alveolar proteinosis]] is unknown.
* The primary pathogenesis of [[pulmonary alveolar proteinosis]] involves reduction in [[granulocyte-macrophage colony-stimulating factor]] ([[Granulocyte macrophage colony stimulating factor|GM-CSF]]) levels or function and/or impaired alveolar [[macrophage]] function.
*  Terminal [[Bronchiole|bronchioles]] and [[Pulmonary alveolus|alveoli]] are filled with a lipoproteinaceous material that will be [[Periodic acid-Schiff stain|periodic acid-Schiff]] ([[Periodic acid-Schiff stain|PAS]]) stain positive.
* If left untreated, patients with [[pulmonary alveolar proteinosis]] may progress to develop pulmonary [[fibrosis]] or [[Right heart failure|cor pulmonale]].
'''For more information about pulmonary alveolar proteinosis, [[Pulmonary alveolar proteinosis|click here]].'''


[[Interstitial lung disease history and symptoms|History and Symptoms]] | [[Interstitial lung disease physical examination|Physical Examination]] | [[Interstitial lung disease laboratory findings|Laboratory Findings]] | [[Interstitial lung disease chest x ray|Chest X ray]] | [[Interstitial lung disease CT|CT]] | [[Interstitial lung disease MRI|MRI]] | [[Interstitial lung disease other imaging findings|Other Imaging Findings]] | [[Interstitial lung disease other diagnostic studies|Other Diagnostic Studies]]
== Lymphocytic Infiltrative Disorders ==
Lymphocytic infiltrative disorders might cause interstitial lung disease in mostly [[Human Immunodeficiency Virus (HIV)|HIV]] positive children.<ref name="pmid27514593">{{cite journal |vauthors=Panchabhai TS, Farver C, Highland KB |title=Lymphocytic Interstitial Pneumonia |journal=Clin. Chest Med. |volume=37 |issue=3 |pages=463–74 |date=September 2016 |pmid=27514593 |doi=10.1016/j.ccm.2016.04.009 |url=}}</ref><ref name="pmid9363179">{{cite journal |vauthors=Fishback N, Koss M |title=Update on lymphoid interstitial pneumonitis |journal=Curr Opin Pulm Med |volume=2 |issue=5 |pages=429–33 |date=September 1996 |pmid=9363179 |doi= |url=}}</ref>
* The etiology of lymphocytic infiltrative disorders is unknown. However, there is an evidence of infectious cause such as [[Epstein Barr virus|EBV]] in [[Human Immunodeficiency Virus (HIV)|HIV]] positive patients.
* The two main manifestations of lymphocytic infiltrative disorders include:
** [[Lymphocytic interstitial pneumonia|Lymphocytic interstitial pneumonitis]]
** Pulmonary lymphomatoid granulomatosis


==Treatment==
'''For more information about lymphocytic interstitial pneumonitis, [[Lymphocytic interstitial pneumonitis|click here]].'''


[[Interstitial lung disease medical therapy|Medical Therapy]] | [[Interstitial lung disease primary prevention|Primary Prevention]] | [[Interstitial lung disease secondary prevention|Secondary Prevention]] | [[Interstitial lung disease cost-effectiveness of therapy|Cost-Effectiveness of Therapy]] | [[Interstitial lung disease future or investigational therapies|Future or Investigational Therapies]]
== Pulmonary Lymphangioleiomyomatosis ==
Lymphangiomyocytosis (LAM) is defined as a multifocal neoplasm with differentiation of the perivascular epithelioid cell that involves multiple organs.<ref name="pmid29487252">{{cite journal |vauthors=Verma AK, Joshi A, Mishra AR, Kant S, Singh A |title=Pulmonary lymphangioleiomyomatosis presenting as spontaneous pneumothorax treated with sirolimus - A case report |journal=Lung India |volume=35 |issue=2 |pages=154–156 |date=2018 |pmid=29487252 |doi=10.4103/lungindia.lungindia_60_17 |url=}}</ref>
* Lymphangiomyomatosis is the result of disorderly [[smooth muscle]] proliferation throughout the [[Bronchiole|bronchioles]], [[Alveolus|alveolar]] septa, perivascular spaces, and [[Lymphatic system|lymphatics]], resulting in the obstruction of small airways (leading to pulmonary [[cyst]] formation and [[pneumothorax]]) and [[Lymphatic system|lymphatics]] (leading to [[Chyle|chylous]] [[pleural effusion]]).
* [[LAM]] occurs in a sporadic form, which only affects females, who are usually of childbearing age.
'''For more information about pulmonary lymphangioleiomyomatosis, [[Lymphangiomyomatosis|click here]].'''


==Case Studies==
== Pulmonary Hemorrhage Syndromes ==
[[Interstitial lung disease case study one|Case #1]]
Pulmonary hemorrhage syndromes might cause interstitial lung disease.
* Several pulmonary hemorrhage syndromes that affect the lung [[parenchyma]] and eventually lead to pulmonary [[fibrosis]]. Some of these are as follows:
** [[Goodpasture syndrome]]
** Idiopathic pulmonary hemosiderosis
** Isolated pulmonary capillaritis


== Interstitial Lung Disease Associated with Systemic Diseases ==
=== Interstitial lung disease associated with connective tissue diseases ===
* [[Systemic lupus erythematosus]]
* [[Rheumatoid arthritis]]
* [[Ankylosing spondylitis]]
* [[Systemic sclerosis]]
* [[Sjögren syndrome]]
* [[Polymyositis]]/[[dermatomyositis]]
* [[Granulomatosis with polyangiitis]] (Wegener's)
* [[Eosinophilic granulomatosis with polyangiitis]] (Churg Strauss)


{{Respiratory pathology}}
=== Interstitial lung disease associated with inherited diseases ===
* [[Tuberous sclerosis]]
* [[Neurofibromatosis]]
* [[Niemann−Pick disease]]
* [[Gaucher disease]]
* [[Hermansky−Pudlak syndrome]]


[[Category:Disease]]
=== Interstitial lung disease associated with gastrointestinal or liver diseases ===
* [[Crohn disease]]
* [[Primary biliary cirrhosis]]
* Chronic active [[hepatitis]]
* [[Ulcerative colitis]]


[[Category:Pulmonology]]
=== Interstitial lung disease associated with graft−versus−host disease ===
* [[Bone marrow transplantation]]
* Solid [[organ transplantation]]


[[de:Interstitielle Lungenerkrankung]]
== Granulomatous Lung Response ==
[[es:Enfermedad pulmonar intersticial]]
* [[Hypersensitivity pneumonitis]]
[[ja:間質性肺炎]]
* [[Sarcoidosis]]
[[fi:Keuhkoparenkyymisairaudet]]
* Granulomatous vasculitides
** [[Granulomatosis with polyangiitis]] (Wegener)
** [[Eosinophilic granulomatosis with polyangiitis]] (Churg Strauss)
* Bronchocentric granulomatosis
'''For more information about hypersensitivity pneumonitis, [[Hypersensitivity pneumonitis|click here]].'''


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==References==
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Latest revision as of 03:31, 13 February 2020

Interstitial Lung Disease

Home

Patient Information

Overview

Classification

Fibrosis lung response
Occupational lung disease
Drug-induced lung injury
Radiation-induced lung injury
Smoking related interstitial lung disease
Idiopathic interstitial pneumonia
Pulmonary alveolar proteinosis
Lymphocytic infiltrative disorders
Pulmonary lymphangioleiomyomatosis
Pulmonary hemorrhage syndromes
Interstitial lung disease associated with systemic diseases
Granulomatous lung response

Pathophysiology

Differentiating Interstitial Lung Disease from other Diseases

Laboratory Finidngs

For the WikiPatient page for this topic, click here

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sadaf Sharfaei M.D.[2], Anmol Pitliya, M.B.B.S. M.D.[3], Saarah T. Alkhairy, M.D.

Synonyms and keywords: Diffuse parenchymal lung disease; DPLD; ILD

Overview

Interstitial lung disease is a group of disorders involving pulmonary parenchyma. The exact pathogenesis of these disorders is not completely understood. There are multiple initiating factors that may lead to pulmonary injury. However, immunopathogenic responses of lung tissue are quite similar. The major histopathologic patterns in response to lung injury include inflammation, fibrosis and granulomatous response. Interstitial lung disease may be classified into several subtypes based on the lung response to tissue injury and the cause of injury. The underlying cause of interstitial lung disease may include factors such as toxic environmental or occupational exposure, cigarette smoking, and radiation. Interstitial lung disease may also be idiopathic.

Classification

Interstitial lung disease may be classified on the basis of lung response to tissue injury. The lung response to tissue injury may be characterized as:[1]

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interstitial lung disease
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Lung Response:
Granulomatous
 
 
 
 
 
 
 
 
 
 
 
Lung Response:
Alveolitis,
Interstitial Inflammation,
and Fibrosis
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Known
 
 
 
 
 
Idiopathic (Unknown)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Hypersensitivity pneumonitis (organic dusts)
 
Inorganic dusts
 
Sarcoidosis
 
Lymphomatoid granulomatosis
 
Granulomatous vasculitides
 
Bronchocentric granulomatosis
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Beryllium
 
Silica
 
 
 
 
 
Eosinophilic granulomatosis with polyangiitis (Churg Strauss syndrome)
 
Granulomatosis with polyangiitis (Wegener's)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Known cause
 
 
 
 
 
 
 
Idiopathic (Unknown)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Drug-induced pulmonary toxicity
 
Occupational and environmental exposure
 
Radiation-induced lung injury
 
Aspiration pneumonia
 
Smoking-related
 
Residual of acute respiratory distress syndrome
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Inhaled inorganic dust
 
Inhaled organic dusts
 
Inhaled agents other than inorganic or organic dusts
 
Desquamative interstitial pneumonia
 
Respiratory bronchiolitis–associated interstitial lung disease
 
Pulmonary Langerhans cell granulomatosis
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pulmonary alveolar proteinosis
 
Idiopathic interstitial pneumonias
 
Lymphocytic infiltrative disorders
(lymphocytic interstitial pneumonitis
associated with connective tissue disease)
 
Connective tissue
diseases
 
Gastrointestinal or
liver diseases
 
Inherited diseases
 
Graft-versus-host disease
 
Pulmonary hemorrhage syndromes
 
Eosinophilic
pneumonias
 
Lymphangioleiomyomatosis
 
Amyloidosis
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Major idiopathic interstitial pneumonias
 
Rare idiopathic interstitial pneumonias
 
Unclassifiable idiopathic interstitial pneumonias
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
• Idiopathic pulmonary fibrosis
• Idiopathic nonspecific interstitial pneumonia
• Respiratory bronchiolitis-interstitial lung disease
• Desquamative interstitial pneumonia
Cryptogenic organising pneumonia
• Acute interstitial pneumonia
 
• Idiopathic lymphoid interstitial pneumonia
• Idiopathic pleuroparenchymal fibroelastosis
 
 
 
 
 
Systemic lupus erythematosus
Rheumatoid arthritis
Ankylosing spondylitis
Systemic sclerosis
Sjögren syndrome
Polymyositis
Dermatomyositis
 
Crohn disease
Primary biliary cirrhosis
• Chronic active hepatitis
Ulcerative colitis
 
Tuberous sclerosis
Neurofibromatosis
Niemann-Pick disease
Gaucher disease
• Hermansky-Pudlak syndrome
 
Bone marrow transplantation
• Solid organ transplantation
 
Goodpasture syndrome
• Idiopathic pulmonary hemosiderosis
• Isolated pulmonary capillaritis
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Pathophysiology

  • Interstitial lung disease is a group of disorders affecting pulmonary parenchyma.
  • The exact pathogenesis of these disorders is not completely understood.
  • There are multiple initiating factors that may cause pulmonary injury. However, immunopathogenic responses of lung tissue are quite similar.
  • There are two major histopathologic patterns in response to lung injury which include:


Algorithm showing pathophysiology of Interstitial Lung Disease[2]


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Tissue injury in lungs
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Parenchymal injury
 
 
 
 
 
 
 
 
 
Vascular injury
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mast cells in lungs in response to tissue injury
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
LPA6, LPA2, and LPA4 receptors[3]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Decreased sFRP-1 (secreted frizzled-related protein 1) in fibroblasts[4]
 
Secretes tryptase
 
Transforming growth factor-β (TGF-β)[5]
 
 
 
 
Insulin-like growth factor (IGF) signalling[4]
 
 
 
 
 
 
 
Reduced expression of angiogenic factors,
vascular endothelial growth factor (VEGF)[6]
 
Elevation of angiostatic factors,
pigment epithelium-derived factor[7]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Wnt/β-catenin signalling pathway[8][9]
 
PAR-2/protein kinase (PK)C-α/Raf-1/p44/42 signaling pathway[10]
 
Upregulation of Egr-1 (early growth response protein 1)[11]
 
IGF-binding protein 5 (IGFBP-5)[12]
 
 
 
IGF-binding protein 3 (IGFBP-3)
 
 
 
 
 
 
 
Loss of endothelial barrier function
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Dysregulation of repair in lung tissue and activation of fibroblasts[13]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulates transforming growth factor-β (TGF-β)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Induction of syndecan-2 (SDC2)[14]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Activation,proliferation, and migration of fibroblast to the site of injury
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fibroblasts
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Altered PTEN (phosphatase and tensin homologue)/Akt axis
 
 
 
 
Acquire contractile stress fibres
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Inactivates Fox (forkhead box) O3a[15]
 
 
 
 
Protomyofibroblast, composed of cytoplasmic actins
 
Pleural mesothelial cells (PMCs)[16][17]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Downregulation of caveolin-1 (cav-1) and Fas expression[18]
 
 
 
 
De novo expression of α-smooth muscle actin (α-SMA)
 
TGF-β1-dependent mesothelial–mesenchymal transition
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fibroblast resistant to apoptosis[19]
 
 
 
 
 
 
Myofibroblasts[20]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Different ranges of contractions mediated by RhoA/Rho-associated kinase
 
 
Changes in intracellular calcium concentrations
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Recruitement of fibrocytes in lungs
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Lock step mechanism of cyclic and contractile events[21]
 
 
 
 
 
 
 
 
 
T-helper cell type 2 on site of injury[22][23]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Upregulation of C-X-C chemokine receptor type 4 (CXCR4)
on fibrocytes and its ligand
CXCL12 (stromal cell-derived factor 1)[24]
 
 
 
 
 
Excess extracellular matrix production
 
 
 
 
 
Exerting traction force
 
 
 
 
 
 
 
 
 
Interleukin-13
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Migration of fibrocytes to the site of injury[25]
 
 
 
 
 
Tissue remodelling[26]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Alternate pathway activation of macrophages[27]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Lung Fibrosis
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Differentiating Interstitial Lung Disease from other Diseases

To review the complete differential diagnosis of dyspnea, click here.

To review the complete differential diagnosis of hemoptysis, click here.

To review the complete differential diagnosis of restrictive lung disease, click here.

Abbreviations: ABG: Arterial blood gas, BAL: Bronchoalveolar lavage, ESR: Erythrocyte sedimentation rate, CRP: C–reactive protein, FVC: Forced vital capacity, RV: Residual volume, FEV1: Forced expiratory volume during the 1st second, DLCO: Diffusing capacity of the lungs for carbon monoxide, O2: Oxygen, TLC: Total lung capacity, PaO2: Arterial partial pressure of oxygen, FiO2: Fraction of inspired oxygen, LDH: Lactate dehydrogenase, CEA: Carcinoembryonic antigen, Anti-GBM antibody: Anti-glomerular basement membrane antibody, A−a gradient: Alveolar-arterial gradient, PAS: Periodic acid-Schiff stain, LAM: Lymphangiomyomatosis, IgE: Immunoglobulin E, ANCA: Anti-neutrophil cytoplasmic antibody, RBC: Red blood cell, ACE: Angiotensin-converting enzyme

Disease Clinical manifestation Investigations
History Symptoms Physical examination Lab findings Imaging Pulmonary function test Bronchoscopy and BAL Gold standard
Duration Age Gender Family history Smoking history Environmental exposure HIV Dyspnea Cough Wheezing Chest pain Tachypnea   Auscultation Cyanosis Clubbing Spirometry ABG
Idiopathic pulmonary fibrosis[28] Chronic 60−70 years old Men + + ± + Dry + + + +
  • Bibasilar, peripheral reticular abnormalities
  • Focal honeycomb cyst formation
  • Traction bronchiectasis
  • Diagnosis of exclusion 
  • Lung biopsy
Idiopathic nonspecific interstitial pneumonia[29] Acute/Chronic 50−60 years old Female + + + + + + ±
  • Normal
  • Nonspecific
  • Lung biopsy and multidisciplinary approach
Cryptogenic organizing pneumonia[30] Acute/subacute 50−60 years old Both ± + Dry
Disease History Symptoms Physical examination Lab findings Imaging Pulmonary function test Bronchoscopy and BAL Gold standard
Duration Age Gender Family history Smoking history Environmental exposure HIV Dyspnea Cough Wheezing Chest pain Tachypnea   Auscultation Cyanosis Clubbing Spirometry ABG
Acute interstitial pneumonia (Hamman−Rich syndrome)[31] Acute 50−60 years old Both + + +
  • N/A
Lymphocytic interstitial pneumonia[32] Subacute 30−40 years old Female ± + + + + +
Respiratory bronchiolitis−interstitial lung disease[33] Subacute 30−40 years old Both + + Dry +
  • Inspiratory high−pitched rhonchi
  • Fine, bibasilar end−inspiratory crackles
  • Nonspecific 
  • Diffuse or patchy ground glass opacities in a mosaic pattern 
  • Fine nodules 
  • Air trapping
  • Clinical evaluation and investigations
Desquamative interstitial pneumonia[34][35] Chronic 40−50 years old Both + + Dry +
  • Fine, bibasilar end−inspiratory crackles
  • Nonspecific 
  • Ground glass opacities without the peripheral reticular and reticulonodular opacities
Disease History Symptoms Physical examination Lab findings Imaging Pulmonary function test Bronchoscopy and BAL Gold standard
Duration Age Gender Family history Smoking history Environmental exposure HIV Dyspnea Cough Wheezing Chest pain Tachypnea   Auscultation Cyanosis Clubbing Spirometry ABG
Pulmonary Langerhans cell granulomatosis[36] Chronic 20−40 years old Both + + ± Dry + +
  • Unremarkable
  • Nonspecific 
  • Normal
Pulmonary alveolar proteinosis[37][38] Acute/chronic 40−50 years old Male + + + + + + + +
  • Bbilateral perihilar and basilar alveolar opacities without air−bronchograms
  • "Bat wing" distribution
  • Intralobular thickening
  • Diffuse ground−glass opacities
Pulmonary lymphangioleiomyomatosis[39] Acute/chronic 30−40 years old Female + + + Bloody + + +
Eosinophilic pneumonia[40] Acute/chronic 20−40 years old Male + Dry + + +
  • Clinical evaluation and investigations
Hypersensitivity pneumonitis[41] Acute/subacute/chronic 40−60 years old Both ± + + Dry/productive + + + +
  • Centrilobular ground−glass or nodular opacities of mid−to−upper zone 
  • Air−trapping
Disease History Symptoms Physical examination Lab findings Imaging Pulmonary function test Bronchoscopy and BAL Gold standard
Duration Age Gender Family history Smoking history Environmental exposure HIV Dyspnea Cough Wheezing Chest pain Tachypnea   Auscultation Cyanosis Clubbing Spirometry ABG
Occupational lung disease[42] Chronic Elderly Male + + + ± + + + + Peripheral/central +
  • Mineral dust +
  • History of environmental exposure and imaging
  • Lung biopsy not required
Radiation−induced lung injury[43] Subacute/chronic Any age Both + + Dry + + + +
  • Nonspecific
  • History of irradiation and clinical presentation
Pulmonary hemorrhage syndromes Goodpasture syndrome[44] Chronic All ages Male + ± ± Bloody ±
  • Pulmonary infiltrates
  • Normal
  • NA
Idiopathic pulmonary hemosiderosis[45] Acute/subacute/chronic Children − 10 years old Both + ± + Bloody + +
  • O2
  • ↓ CO2
  • Clinical evaluation and investigations
Isolated pulmonary capillaritis[46] Chronic 40−60 years old Both + ± + Bloody + + +
  • Diagnosis of exclusion
Disease History Symptoms Physical examination Lab findings Imaging Pulmonary function test Bronchoscopy and BAL Gold standard
Duration Age Gender Family history Smoking history Environmental exposure HIV Dyspnea Cough Wheezing Chest pain Tachypnea   Auscultation Cyanosis Clubbing Spirometry ABG
Sarcoidosis[47] Acute/subacute/chronic 20−40 years old Female + ± ± + + ± +
  • Clinical evaluation and investigations
Granulomatous vasculitides Granulomatosis with polyangiitis (Wegener)[48] Chronic Elderly Both + + + + ±
  • Alveolar hemorrhage
Eosinophilic granulomatosis with polyangiitis (Churg Strauss)[49] Chronic 40−50 years old Both + + +
  • Areas of parenchymal opacification
  • Mixed interstitial patchy alveolar opacities
  • Normal
Bronchocentric granulomatosis[50] Chronic 30−70 years old Both ± ± + ±
  • Normal
Pulmonary lymphomatoid granulomatosis[51] Chronic 30−50 years old Male + + + +
  • Normal
  • Mid to lower zone multiple poorly defined nodules
  • Diffuse reticular abnormalities
  • Normal
  • Normal
Amyloidosis[52][53] Subacute/chronic 50−70 years old Male + Bloody +
  • Congophilia with apple−green birefringence under polarized light
  • Normal
Disease History Symptoms Physical examination Lab findings Imaging Pulmonary function test Bronchoscopy and BAL Gold standard
Duration Age Gender Family history Smoking history Environmental exposure HIV Dyspnea Cough Wheezing Chest pain Tachypnea   Auscultation Cyanosis Clubbing Spirometry ABG

Laboratory Finidngs

There are multiple laboratory tests that may be helpful to ascertain or rule out the diagnosis of interstitial lung disease.

Condition Disease Investigation
All patients with suspicious interstitial lung disease Complete blood count and differential
Liver function tests Alanine aminotransferase (ALT, SGPT)
Aspartate aminotransferase (AST, SGOT)
Alkaline phosphatase
Renal function tests Urinalysis
Blood urea nitrogen (BUN)
Creatinine (Cr)
Suspicious of systemic rheumatic disease RA Serology Anti−cyclic citrullinated peptide (Anti-CCP)
SLE Serology Anti−double stranded DNA antibodies (Anti-dsDNA antibody)
Amyopathic dermatomyositis Serology Anti-melanoma differentiation-associated gene 5 (MDA-5)
Nonspecific Serology Antinuclear antibody (ANA)
Serology Rheumatoid factor (RF)
Serology Anti-neutrophil cytoplasmic antibody (ANCA)
Enzyme Creatine kinase (CK), aldolase
Mechanic hands Myositis Myositis−associated antibodies Anti-tRNA synthetases Jo-1
Anti-tRNA synthetases PL-7
Anti-tRNA synthetases PL-12
Sicca features or positive anti−extractable nuclear antigen (ENA) Sjögren’s syndrome Serology Anti-RO (SS−A)
Serology Anti-La (SS−B)
Mixed connective tissue disease  Serology Anti-ribonucleoprotein (RNP)
IgG4-related disease Serology Serum IgG4
Severe GERD or sclerodactyly Limited systemic scleroderma Serology Anti-centromere
Systemic scleroderma Serology Anti-topoisomerase I (anti-Scl-70)
Dyspnea Heart failure Enzyme Brain natriuretic peptide (BNP)
Pulmonary hypertension N-terminal proBNP (NT-proBNP)
Anemia and/or hemoptysis Coagulopathies Coagulation studies
Goodpasture syndrome Serology Anti−glomerular basement membrane (GBM) antibodies
Antiphospholipid syndrome Serology Antiphospholipid antibodies
Idiopathic pulmonary hemosiderosis Serology Serum IgA endomysial or tissue transglutaminase antibodies 
Mediastinal lymphadenopathy Multiple myeloma Serum protein electrophoresis
Beryllium exposure Berylliosis Peripheral blood beryllium lymphocyte proliferation test
Risk factors for HIV HIV ELISA
Western blot test

Occupational Lung Disease

For more information about occupational lung disease, click here.

Drug-induced lung injury

More than 600 medications have pulmonary toxicity and may cause lung injury.[55]

Drug−induced lung injury
Antimicrobial Agents Anti−Inflammatory Agents Biological Agents Cardiovascular Agents Immunomodulator agents Antineoplastic agents Miscellaneous

Radiation-induced Lung Injury

Radiation has been considered as one of the causes of lung injury. About 5 to 15% of patients receiving radiation therapy may present with pulmonary symptoms.[71]

Smoking related Interstitial Lung Disease

Cigarette smoking may cause various adverse effects on pulmonary tissue.[74][75][76]

Idiopathic Interstitial Pneumonia

The idiopathic interstitial pneumonias (IIP) are a broad range of interstitial lung diseases of unknown etiology.[77][78][79][80][81][82]

For more information about Idiopathic interstitial pneumonia, click here.

For more information about idiopathic pulmonary fibrosis, click here.

For more information about Cryptogenic organizing pneumonia, click here.

Pulmonary Alveolar Proteinosis

Pulmonary alveolar proteinosis (PAP) is a rare lung disease that is characterized by the intra-alveolar accumulation of surfactant phospholipid and apoproteins.[83][84]

For more information about pulmonary alveolar proteinosis, click here.

Lymphocytic Infiltrative Disorders

Lymphocytic infiltrative disorders might cause interstitial lung disease in mostly HIV positive children.[85][86]

  • The etiology of lymphocytic infiltrative disorders is unknown. However, there is an evidence of infectious cause such as EBV in HIV positive patients.
  • The two main manifestations of lymphocytic infiltrative disorders include:

For more information about lymphocytic interstitial pneumonitis, click here.

Pulmonary Lymphangioleiomyomatosis

Lymphangiomyocytosis (LAM) is defined as a multifocal neoplasm with differentiation of the perivascular epithelioid cell that involves multiple organs.[87]

For more information about pulmonary lymphangioleiomyomatosis, click here.

Pulmonary Hemorrhage Syndromes

Pulmonary hemorrhage syndromes might cause interstitial lung disease.

  • Several pulmonary hemorrhage syndromes that affect the lung parenchyma and eventually lead to pulmonary fibrosis. Some of these are as follows:

Interstitial Lung Disease Associated with Systemic Diseases

Interstitial lung disease associated with connective tissue diseases

Interstitial lung disease associated with inherited diseases

Interstitial lung disease associated with gastrointestinal or liver diseases

Interstitial lung disease associated with graft−versus−host disease

Granulomatous Lung Response

For more information about hypersensitivity pneumonitis, click here.

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