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__NOTOC__
'''For patient information, click [[Myelofibrosis (patient information)|here]]'''
{{DiseaseDisorder infobox |
{{DiseaseDisorder infobox |
   Name          = Myelofibrosis |
   Name          = Myelofibrosis |
  ICD10          = {{ICD10|C|94|5|c|81}}, {{ICD10|D|47|1|d|37}} |
  ICD9          = {{ICD9|289.89}} |
   Image          = Myelofibrosis micro.jpg|
   Image          = Myelofibrosis micro.jpg|
   Caption        = Bone marrow: Myelofibrosis: High mag H&E excellent example of myelofibrosis. <br> <small> [http://www.peir.net Image courtesy of Professor Peter Anderson DVM PhD and published with permission © PEIR, University of Alabama at Birmingham, Department of Pathology] </small> |
   Caption        = Bone marrow: Myelofibrosis: High mag HandE excellent example of myelofibrosis. <br> <small> [http://www.peir.net Image courtesy of Professor Peter Anderson DVM PhD and published with permission © PEIR, University of Alabama at Birmingham, Department of Pathology] </small> |
  ICDO          = 9932, 9961 |
  OMIM          = |
  DiseasesDB    = 8616 |
  MedlinePlus    = |
  eMedicineSubj  = |
  eMedicineTopic = |
  MeshID          = D009191 |
}}
}}
{{Search infobox}}
{{Myelofibrosis}}
{{CMG}}
{{CMG}} {{AE}} {{Sab}}; {{MJK}}; {{SR}}


{{EH}}
{{SK}} Agnogenic myeloid metaplasia; AMM; Myeloid metaplasia; Myeloid metaplasia, NOS; Myelofibrosis with myeloid metaplasia; MMM; Assmann's disease; Chronic granulocytic-megakaryocytic myelosis; Chronic granulocytic megakaryocytic myelosis; Megakaryocytic myelosclerosis; Chronic idiopathic myelofibrosis; CIMF; Heuck-Assmann disease; Idiopathic myelofibrosis; Primary myelofibrosis; PMF; Prefibrotic primary myelofibrosis; Secondary myelofibrosis; Myelosclerosis; Osteomyelofibrosis; Osteomyelosclerosis; Myeloproliferative disorder


==Overview==
==[[Myelofibrosis overview|Overview]]==


'''Myelofibrosis with myeloid metaplasia''', also known as '''agnogenic myeloid metaplasia''', '''chronic idiopathic myelofibrosis''', and '''primary myelofibrosis''',<ref>Older terms include "myelofibrosis with myeloid metaplasia" and "agnogenic myeloid metaplasia". The [[World Health Organization]] utilizes the name "chronic idiopathic myelofibrosis", while the International Working Group on Myelofibrosis Research and Treatment calls the disease "primary myelofibrosis".</ref> was first described in 1879 and is currently classified as a [[myeloproliferative disease]] caused by the growth and proliferation of an abnormal [[bone marrow]] stem cell, resulting in the [[fibrosis|replacement of the bone marrow with fibrous connective tissue]]. An eponym for the disease is Heuck-Assmann disease, or Assmann's Disease.
==[[Myelofibrosis historical perspective|Historical Perspective]]==


==Pathophysiology==
==[[Myelofibrosis classification|Classification]]==


The bone marrow is replaced by collagen fibrosis, impairing the patient's ability to generate new blood cells resulting in a progressive [[pancytopenia]]. It is usually reactive following other [[myeloproliferative disorders]], such as [[polycythemia rubra vera]] or [[essential thrombocytosis]]. Extramedullary hematopoeisis occurs as the haemopoetic cells migrate away from the bone marrow, to the liver and spleen. Patients often have [[hepatosplenomegaly]] and [[poikilocytosis]].
==[[Myelofibrosis pathophysiology|Pathophysiology]]==


In primary myelofibrosis, a progressive scarring ([[fibrosis]]) of the bone marrow occurs. As a result, blood forms in sites other than the bone marrow, such as the [[liver]] and [[spleen]]. This causes an enlargement of these organs. The cause and risk factors are unknown.  It commonly occurs in the spent phase of [[Polycythemia rubra vera]], possibly in response to the medication [[hydroxyurea]] poisoning the marrow.
==[[Myelofibrosis causes|Causes]]==


Genetic associations with [[JAK2]]<ref name="pmid15781101">{{cite journal |author=Baxter EJ, Scott LM, Campbell PJ, ''et al'' |title=Acquired mutation of the tyrosine kinase JAK2 in human myeloproliferative disorders |journal=Lancet |volume=365 |issue=9464 |pages=1054–61 |year=2005 |pmid=15781101 |doi=10.1016/S0140-6736(05)71142-9 |url=http://linkinghub.elsevier.com/retrieve/pii/S0140-6736(05)71142-9}}</ref> and [[Myeloproliferative leukemia virus oncogene|MPL]]<ref name="pmid16834459">{{cite journal |author=Pikman Y, Lee BH, Mercher T, ''et al'' |title=MPLW515L is a novel somatic activating mutation in myelofibrosis with myeloid metaplasia |journal=PLoS Med. |volume=3 |issue=7 |pages=e270 |year=2006 |month=July |pmid=16834459 |pmc=1502153 |doi=10.1371/journal.pmed.0030270 |url=http://medicine.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.pmed.0030270}}</ref> have been described.
==[[Myelofibrosis differential diagnosis|Differentiating Myelofibrosis from other Diseases]]==


== Signs and symptoms == 
==[[Myelofibrosis epidemiology and demographics|Epidemiology and Demographics]]==
*Abdominal fullness related to an [[splenomegaly|enlarged spleen]] (splenomegaly).
*Bone pain
*Bruising and easy bleeding due to inadequate numbers of [[platelets]]
*Fatigue
*Increased susceptibility to infection, such as [[pneumonia]] or [[diarrhea]]
*Pallor and shortness of breath while doing physical work due to [[anemia]]


==Diagnosis==
==[[Myelofibrosis risk factors|Risk Factors]]==
Diagnosis is based upon:
# Normochromic normocytic anaemia
# Red cell poikilocytosis on blood film (tear drop RBCs)
# JAK 2 mutation on Val 617 Phe locus in 50%
# Raised lactate dehydrogenase
# Raised neutrophil alkaline phosphatase score
# Bone marrow biopsy may show increased cellularity and fibrosis


==Diagnostic Findings==
==[[Myelofibrosis screening|Screening]]==


===MRI===
==[[Myelofibrosis natural history, complications and prognosis|Natural History, Complications and Prognosis]]==


([http://www.radswiki.net Images courtesy of RadsWiki])
==Diagnosis==
 
[[Myelofibrosis diagnostic study of choice|Diagnostic Study of Choice]] | [[Myelofibrosis history and symptoms|History and Symptoms]] | [[Myelofibrosis physical examination|Physical Examination]] | [[Myelofibrosis laboratory tests|Laboratory Findings]] | [[Myelofibrosis electrocardiogram|Electrocardiogram]] | [[Myelofibrosis x ray|X Ray]] | [[Myelofibrosis CT|CT]] | [[Myelofibrosis MRI|MRI]] | [[Myelofibrosis echocardiography or ultrasound|Echocardiography or Ultrasound]] | [[Myelofibrosis other imaging findings|Other Imaging Findings]] | [[Myelofibrosis other diagnostic studies|Other Diagnostic Studies]]
<gallery>
Image:Myelofibrosis_MRI_001.jpg|Myelofibrosis
Image:Myelofibrosis_MRI_002.jpg|Myelofibrosis
</gallery>


<gallery>
==Treatment==
Image:Myelofibrosis_MRI_003.jpg|Myelofibrosis
[[Myelofibrosis medical therapy|Medical Therapy]] | [[Myelofibrosis surgery|Surgery]] | [[Myelofibrosis primary prevention|Primary Prevention]] | [[Myelofibrosis secondary prevention|Secondary Prevention]] | [[Myelofibrosis cost-effectiveness of therapy|Cost-Effectiveness of Therapy]] | [[Myelofibrosis future or investigational therapies|Future or Investigational Therapies]]
Image:Myelofibrosis_MRI_004.jpg|Myelofibrosis
</gallery>


== References ==
==Case Studies==
{{reflist}}
[[Myelofibrosis case study one|Case # 1]]


<br>
{{Hematology}}
{{Hematological malignancy histology}}
{{SIB}}


==Related chapters==
* [[Myelophthisic anemia]]


[[Category:Medicine]]
[[Category:Hematology]]
[[Category:Hematology]]
[[Category:Oncology]]
[[Category:Oncology]]
 
[[Category:Neurology]]
[[bn:মজ্জাকাঠিন্য]]
[[Category:Neurosurgery]]
[[de:Osteomyelofibrose]]
[[Category:Up-To-Date]]
[[fr:Splénomégalie myéloïde]]
[[it:Mielofibrosi]]
[[pl:Mielofibroza]]
 
{{WH}}
{{WS}}

Latest revision as of 06:34, 28 July 2020

For patient information, click here

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Sabawoon Mirwais, M.B.B.S, M.D.[2]; Mohamad Alkateb, MBBCh [3]; Sujit Routray, M.D. [4]

Synonyms and keywords: Agnogenic myeloid metaplasia; AMM; Myeloid metaplasia; Myeloid metaplasia, NOS; Myelofibrosis with myeloid metaplasia; MMM; Assmann's disease; Chronic granulocytic-megakaryocytic myelosis; Chronic granulocytic megakaryocytic myelosis; Megakaryocytic myelosclerosis; Chronic idiopathic myelofibrosis; CIMF; Heuck-Assmann disease; Idiopathic myelofibrosis; Primary myelofibrosis; PMF; Prefibrotic primary myelofibrosis; Secondary myelofibrosis; Myelosclerosis; Osteomyelofibrosis; Osteomyelosclerosis; Myeloproliferative disorder

Overview

Historical Perspective

Classification

Pathophysiology

Causes

Differentiating Myelofibrosis from other Diseases

Epidemiology and Demographics

Risk Factors

Screening

Natural History, Complications and Prognosis

Diagnosis

Diagnostic Study of Choice | History and Symptoms | Physical Examination | Laboratory Findings | Electrocardiogram | X Ray | CT | MRI | Echocardiography or Ultrasound | Other Imaging Findings | Other Diagnostic Studies

Treatment

Medical Therapy | Surgery | Primary Prevention | Secondary Prevention | Cost-Effectiveness of Therapy | Future or Investigational Therapies

Case Studies

Case # 1


Related chapters