Vascular tumor

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Vascular tumor may mean:

Vascular Tumors

Benign vascular tumors 1

Infantile hemangioma / Hemangioma of infancy

Pattern
  • focal
  • multifocal
  • segmental
  • indeterminate
Different types
  • superficial
  • deep
  • mixed (superficial + deep)
  • reticular / abortive / minimal growth
  • others
Association with other lesions
PHACE association /

syndrome

Posterior fossa malformations, Hemangioma, Arterial

anomalies, Cardiovascular anomalies, Eye anomalies ,

sternal clefting and ⁄ or supraumbilical raphe

LUMBAR (SACRAL,

PELVIS) association /

syndrome

Lower body hemangioma, Urogenital anomalies,

Ulceration, Myelopathy, Bony deformities, Anorectal

malformations, Arterial anomalies, and Renal anomalies

  • Most common tumor of infancy. Usually appearing after birth, infantile hemangiomas undergo a period of proliferation in few weeks after birth followed by regression and involution in first year of life. Superficial lesions appear as red or “strawberry” colored nodules, papules, or plaques while deeper hemangiomas are typically bluish or skin colored. Mixed tumors, involving both epidermis and deeper structures, may display characteristics of both. They may also be classified as focal, that appear in a specific anatomical area, and segmental that shows varied pattern of growth following developmental growth regions. Segmental type is often associated with other developmental abnormalities.[1][2][3]
  • Rarely, infantile hemangioms can cause life-threatening complications such as congestive cardiac failure, respiratory difficulty and respiratory compromise, and loss of vision. There may also be long-term sequela including permanent disfigurement and scarring. If lesions are multiple, there is an increased risk of visceral involvement. There may be an association with certain syndromes such as PHACE syndrome.[1][4]
  • Some studies have indicated autosomal-dominant and maternal patterns of inheritance. Some studies suggest that environmental factors play the key role. Some risk factors that have been identified in association with infantile hemangioma include female gender, preterm birth, low weight at birth, increasing maternal age ta birth, placenta previa, pre-eclampsia, progesterone use by mother, and Caucasian race.[5][1][6][7]
  • THE diagnosis is made clinically and a thorough investigation should be carried out for visceral hemangiomas and other associative abnormalities if suspicion arises. Majority of these lesions do not require any treatment but treatment is indicated if there is risk for complications such as visual or respiratory involvement. Elective treatment is also offered to prevent disfigurement or scarring. Recently there have been an increased usage of oral beta-blockers such as timolol over systemic glucocorticoids because of higher efficacy. Vincristine and interferon alpha have been used in some high risk hemangiomas but carry the risk of severe complications. Visceral hemangioms may require embolization or surgery if they do not respond to systemic therapy. Laser therapy especially PDL is another modality used in cases of hemangioms unresponsive to medication.[1][8][9][10][11][12][13][14][15]
  • To learn more about infantile hemagioma click here.

Congenital hemangioma

  • Rare tumor that arises in utero and presents as fully developed lesion at birth. Following birth they can regress completely, partially or not at all. So they can be classified as Rapidly involuting (RICH), Non-involuting (NICH), Partially involuting (PICH).[16][17]
    1. Rapidly involuting (RICH)
      • This fast flow tumor can be detected in utero and appears as raised gray single lesions with dilated veins, telangiectasias and a halo at birth. This tumor may be complicated by thrombocytopenia and congestive cardiac failure due to its high-flow nature. Tumor typically regresses spontaneously in 1 to 2 years of life. Sometimes it can occur in liver where it follows the same pattern of involution as that of skin.[17][18]
    2. Non-involuting (NICH)
      • Fast flow tumor that presents as well defined, plaque like lesion with pink to purple color, telangiectasias and pale borders. Typically remains stable but there have been some reports of growth and expansion.[17]
    3. Partially involuting (PICH)
      • These lesions start involution as RICH but become stable over time and persist as NICH.[19]
  • Somatic mutations in GNAQ/GNA11 are thought to cause the congenital hemangioma. GNAQ and its paralogue GNA11 function in intracellular signaling pathways as Gq alpha subunit.[17][20]
  • Diagnosis is usually clinical but imaging techniques such as MRI, CT scan, contrast-enhanced ultrasound and later biopsy can be considered if required. Surgical excision should be considered in case of complications, NICH and PICH.[21][22]

Tufted angioma

  • Benign tumor that is characterized by dense clumps of endothelial cells and capillaries located in dermis. Most lesions appear in adolescence but some can manifest at birth or late in adulthood. Clinical presentation varies but majority of lesions appear as solitary stained area or elevation that later forms red-purple or dusky red plaque while some lesions appear as firm nodules. Lesions are usually solitary, asymptomatic but tender with occasional painful episodes and located on trunk and neck in majority of the cases. Some cases of multi-focal tufted angiomas have also been reported.[23][24][25][26]
  • Tufted angioma can be associated with Kasabach-Merritt phenomenon.[26][16][23]
  • Somatic activating GNA14 c.614A>T (p.Gln205Leu) mutations have been found in some tufted angiomas. These mutations may cause the cell growth to be growth-factor independent by up-regulating the MAPK pathway.[27][28]
  • Imaging such as MRI and ultrasound can add into clinical diagnosis to differentiate tufted angioma from similar lesions such as Kaposi sarcoma, kaposiform hemangioendothelioma and infantile hemangioma. Biopsy and histopathological studies are sometimes required for accurate diagnosis. Surgical excision is the treatment modality but some recommend to only observe the lesions due to its slow growth and possible remission. Other therapies include radiation beam therapy, cryosurgery, corticosteroids and pulsed laser therapy. Vincristine and embolization has been used with success in angiomas associated with Kasabach-Merritt phenomenon.[26][29][30][31][32][33][34]

Spindle-cell hemangioma

  • Rare benign tumor that manifests as solitary or multiple nodules confined to dermis and subcutaneous tissues in almost all of the cases. Histopathologically it appears as solid areas that are cellular and consist of spindle cells seen attached to vessel walls, and cavernous spaces that can be thrombosed. Size may increase over time and patient usually complains of swelling and pain. The nodules or masses can be mobile and elastic or can be firm and immobile.[35][36][37]
  • Somatic mutations in IDH1 and IDH2 have been found to be present in 70% of spindle-cell hemangiomas. IDH1 and IDH2 are important enzymes in cell energy cycles (α-ketoglutarate and NADPH generation).[38][39]
  • Diagnosis often requires biopsy and imaging studies such as MRI to ascertain the extent of the tumor. Local excision is the treatment modality of choice with excellent prognosis in majority of the cases although recurrence is very common.[35][36][37][40][41]

Epithelioid hemangioma

  • Rare benign tumor that typically presents as solitary painful nodule on head and neck. Penis is an atypical location. They can involve skin, bone and soft tissues. Histopathologically these lesions are characterized by presence of endothelial cells that resemble epithelial cells with evidence of proliferation such as large nuclei and prominent nucleoli, and often inflammatory infiltrates. Vessels are typically well-formed. Nuclear atypia is absent.[42][43][44]
  • FOS gene rearrangements such as ZFP36-FOSB fusions are found to be present in one third of epithelioid hemangioma in a study. It encodes a transcription factors that causes over-expression of vascular endothelial growth factor-D (VEGF-D).[45][46][47][48]
  • Diagnosis requires biopsy to determine characteristic histopathological features. Imaging techniques such as MRI can useful. Bone tumors often require surgery for accurate diagnosis. Surgical excision has been used in majority of cases. Other treatment modalities include radiotherapy and embolization. Recently chemoembolization and microwave ablation in combination have been used with success.[42][43][49]

Pyogenic granuloma

  • Also called as lobular capillary hemangioma, this common vascular lesion typically manifests as single, localized nodules on gingiva with sessile base but large lesions often present as lobulated or pediculated . Majority of the lesions are <2 cm in diameter and color of the lesion depending on vascularity varies from pink to purple. It can found anywhere on skin and mucous membranes such as lips, tongues, palate, and on atypical locations such asperiungual or gastrointestinal tract but gingiva is the typical location. Majority of the patients present with profuse bleeding. Others complain of painless mass, swelling, obstructive or interference related symptoms.[50][51][52][53]
  • Trauma or chronic irritation have been cited as the most common causes but it can arise due to multiple other factors such as medications, viral infections such as herpes virus type 1, Orf virus and/or human papilloma virus type 2, and BRAF mutations or use of BRAF inhibitors that can cause multiple, disseminated lesions. Medications that have been implicated in development of this lesion include oral contraceptives, retinoids, gefitinib, cabecitabine, and afatinib, BRAF inhibitors such as vemurafenib or encorafenib, and rituximab. Mutations in BRAF/RAS/GNA14 have all been associated with pyogenic granuloma, BRAF c.1799T>A has been recently described as one of the major mutations associated.[51][52][53][54][55][56][57]
  • The diagnosis is made by clinical features and then confirmed by histopatholgical features. Current standard of care is surgical excision. Other treatment modalities include curettage, electrocautery, radiosurgery, cryosurgery, sclerotherapy, or laser treatment. Topical or oral beta-blockers timolol or propranolol and topical imiquimod have also been successful.[51][52][58][59][60][61]

Hobnail hemangioma

  • Benign tumor that typically presents as solitary growth with often, but not always, tagetoid appearance of a central papule and peripheral brown ring that may or may not disappear over time. Characteristic histopathological feature include plump endothelial cells in superficial dermis that line ectatic and irregular vessels, and project into lumina like hobnails. Deeper dermis shows vessels dissecting collagen fibers. Majority of the lesions are fund on trunk and extremities with head and neck, and oral cavity as uncommon locations. Patient may present with pain, or an asymptomatic growing lesion.[62][63][64]
  • Etiology is not well understood but trauma may play a key role in pathogenesis. Some studies have found congenital etiology in some lesions.[62][63][65][66]
  • Diagnosis is based on clinical features and histopathological studies. Treatment is usually by excision. Other modalities of treatment include intermittent triamcinolone intralesional injections and pulsed dye laser treatment.[62][63]

Microvenular hemangioma

  • Rare lesion that most often manifests as single asymptomatic nodule, plaque or papule with color varying from red to bluish-red. Majority of the lesions are located on trunk and limbs. Histologically, the tumor consists of irregular and branching venous structures with inconspicuous lumina. Endothelial cells display absence of atypia and mitotic figures. Some lesions may be painful and/or tender.[67][68][69][70]
  • Etiology and pathogenesis have not been well-understood but a recent study may associate progesterone with microvenular hemangioma.[71]
  • Diagnosis requires biopsy because of rarity of this tumor. Treatment is through surgical excision.[67][68][69][70]

Anastomosing hemangioma

  • Rare tumor characterized by presence of anastomosing capillary-sized vessels with irregular fenestration, lined by endothelial cells with absence of atypia and occasional hobnailing. Majority of the lesions are found in kidneys and genitourinary tract with some being located in liver, adrenal glands and gastrointestinal tract. These tumors are typically incidental findings on radiology but some may present with back and/or flank pain with/without radiation to lower limbs.[72][73][74][75][76]
  • Etiology is not well-known but a recent study suggests muations in GNAQ genes that encodes members of G protein family.[77]
  • The diagnosis is very challenging because radiological findings of anastomosing hemangioma are similar to that of malignant tumors such as renal cell carcinoma, hepatocellular carcinoma and low grade angiosarcoma. So excision and biopsy are often suggested. There is no current guidelines for treatment but excision and local ablation are the options.[72][75][74][78][79]

Glomeruloid hemangioma

  • Characterized by red blood cells filled clumps of capillaries inside dilated vascular spaces. These collections of capillaries, lined by swollen endothelial cells, resemble renal glomeruli and stain positive for periodic acid-Schiff (PAS)-positive, diastase-resistant eosinophilic globules. Clinical presentation varies and are not discernible from other cutaneous lesions. Majority of the lesions manifest as multiple, asymptomatic pauples or nodules..[80][81]
  • Glomeruloid hemangioma is associated with POEMS syndrome in majority of the cases and rarely with Castleman's disease. Very few isolated cases of glomeruloid hemangioma have been reported.[80][81]
    • POEMS stands for peripheral neuropathy (P), organomegaly (O), endocrinopathy (E) monoclonal plasma-cells proliferative disorder (M) and skin changes (S) although diagnosis does not require presence of all of these symptoms. Other manifestations of POEMS syndrome may include sclerotic bone lesions, papilledema, edema, ascites, effusions, pulmonary hypertension, Castleman’ disease (CD), thrombocytosis and erythrocytosis, and increased serum VEGF.[82]
    • Castleman’s disease is characterized as lymphoproliferative disorder with inflammatory response involving multiple systems. Clinical presentation ranges from asymptomatic lymphadenopathy to severe systemic manifestations such as weight loss, fever and organomegaly.[83]
  • Etiology is not well-understood but some theories suggest role of vascular endothelial growth factor (VEGF), increased estrogen levels, human herpesvirus-8 and increased cytokines in its pathogenesis.[80][81]
  • Diagnosis relies on characteristic histology. Patients who present with glomeruloid hemangioma should undergo evaluation for POEMS syndrome and should be kept under follow-up because these lesions can precede full-blown POEMS syndrome in some cases.[80][81]

Papillary hemangioma

  • Rare tumor characterized by presence of papillary growths within dilated vascular channels, that contain cores of pericytes around normal capillaries. The tumor typically manifests as solitary papules in head and neck region, without any systemic manifestations.[84][85]
  • Diagnosis may require biopsy. Treatment options include excision and photodynamic therapy.[86]

Intravascular papillary endothelial hyperplasia

  • Also called as Masson's tumor, this benign lesions is characterized by presence of intravascular papillary structures that are enveloped by proliferating endothelial cells. It is considered to be a reactive lesion associated with an organizing thrombus. Clinically it manifests as solitary painless mass in head-neck and the extremities especially the hand, that may grow rapidly in size and become painful and/or tender. Some lesions have been found intra-abdominallly such as in the liver that can bleed and present with anemia.[87][88][89][90]
  • This lesions appears to be associated with vascular trauma, and thrombus that may lead to chronic irritation and increased levels of fibroblast growth factor (FGF), hypoxia-inducible factor-1 (HIF-1α), and vascular endothelial growth factor (VEGF) stimulating endothelial cells proliferation.[88][89][91]
  • Histopathological studies are generally required for diagnosis and may also require immunohistochemical confirmation. Treatment is surgery with uncommon recurrence.[91][92]

Cutaneous epithelioid angiomatous nodule

  • This recently diagnosed lesion is characterized histologically as proliferating, swollen epithelioid cells and thin walled vascular channels lined by swollen endothelial cells that resemble the epithelioid cells. These cells typically contain pale pink cytoplasm, intracytoplasmic vacuoles, and vesicular nuclei. Clinically these lesions manifest as solitary nodules or papules that may grow rapidly. Rarely multiple lesions have also been reported.[93][94][95]
  • Thought to be a reactive process but no trigger has been identified yet. Immunosuppression has been proposed to be associated with this benign vascular proliferation.[93][94]
  • Diagnosis requires careful clinical and histopathological evaluation. Surgery has been the treatment used in majority of the lesions although cryotherapy has also been used. Steroids are found to be ineffective.[93][95]

Acquired elastotic hemangioma

  • First described in 2002, this rare lesion typically manifests as solitary, asymptomatic, red to purple, patches and plaques on areas damaged by sun exposure such as hands and forearms. Some patients may complain of pain or growth of the lesion. Histologically its exhibits solar elastosis and band like proliferation of capillaries in superficial dermis. These proliferating channels are arranged parallel to epidermis and endothelial cells typically display absence of atypia but may show hobnail pattern.[96][97]
  • This lesion has slight preference for females. Damage due to sun exposure such as free radical production are thought to be associated with pathogenesis. Some case reports showed use of progesterone associated with appearance of lesions in perimenopausal women.[96][97][98][99]
  • Diagnosis requires biopsy to rule out basal cell carcinoma and other similar appearing lesions. Treatment options include observation, discontinuance of progesterone, laser therapy and excision. Recurrence was not observed in any of the cases observed or treated.[97][99][96][99][100]

Littoral cell hemangioma of the spleen

  • Benign tumor that originates from cells that line the red pup sinuses. Majority of the patients are asymptomatic but some present with symptoms related to splenic enlargement such as abdominal distension, hypersplenism such as persistent anemia and thrombocytopenia, and constitutional symptoms such as weight loss, fever, and fatigue. Histopathological features include anastomosing vascular channels lined by cuboidal cells, with somewhat rarer presence of papillary structures.[101][102][103][104]
  • Although not well-established, few case reports have demonstrated malignant histology and features in this neoplasm. This tumor can be related to visceral malignancies such as non-Hodgkin's lymphoma, tumors of the liver and brain, epithelial ovarian cancer, non-small cell lung cancer, plasmablastic B-cell lymphoma, villous lymphocyte leukaemia and neoplasm of colon, kidney and pancreas. Association with Crohn's disease and Gaucher's disease has also been described leading to hypothesis of immune dysfunction as a possible cause of littoral cell hemangioma of splen.[102][103][104][105][106][107][108][109][110][111]
  • Preferred diagnostic modality is biopsy often following splenectomy. Fina needle aspiration can also be used. Imaging studies such as MRI and CT scan are inconclusive. All patients with this neoplasm should undergo evaluation for other associated neoplasms especially visceral neoplasms. Splenectomy is the treatment.[101][103][112][113][114]

Related lesions

  • Eccrine angiomatous hamartoma
    • Benign non-neoplastic proliferation of eccrine and capillary structures leading to increased sweat glands and dilated vascular channels in the middle and deep dermis, and subcutaneous structures. Clinical presentations vary remarkably but majority of the lesions are asymptomatic and appear as red to violaceous to brown single nodule or plaque on the extremities but macules, patches, multiple lesions and uncommon sites for the lesion have been reported. Many patients complain of pain, tenderness, increased sweating and excessive hair over the lesion.[115][116][117][118][119]
    • Etiology for this benign lesion has not been established. Diagnosis requires biopsy although imaging studies such as MRI and CT scan can be used to define the extent of the lesion. Asymptomatic lesion do not require treatment. Surgical excision is the treatment of choice if treatment is indicated. Alternative therapies include use of botulinum toxin to treat hyperhidrosis and use of intralesional sclerosants.[115][120][121][122][123][124][125]
  • Reactive angioendotheliomatosis
    • Characterized by hyperplasia of endothelial cells within lumina of vascular channels that leads to formation of thrombi. These secondary thrombi may obstruct lumen of vascular channels. Clinically majority of the lesions manifests as multiple reddish to violaceous macules, papules, or plaques that can be found almost anywhere on the body but tend to involve limbs. Patients may complain of pain and ulceration in the lesion or may report with non-specific symptoms such as fever and weigh loss.[126][127][128]
    • Etiology and pathogenesis is unknown but immune system is hypothesized to play a role in pathogenesis. Majority of the patients have coexistent systemic diseases such as cyroglobulinemia, antiphospholipid syndrome, renal disease, valvular cardiac disease, alcoholic cirrhosis, glioblastoma multiforme, and rheumatoid arthritis/polymyalgia rheumatica. Iatrogenic immunosuppression have also been associated. Based on these associations some consider this lesion as the marker of an underlying systemic disease.[126][129][130]
    • Diagnosis requires biopsy. There is no standard management guideline. Treatment of coexistent systemic disease may cause resolution of reactive angioendotheliomatosis. Management options include observation, antibiotics, , corticosteroids, laser therapy and excision.[126][129]
  • Bacillary angiomatosis
    • Bacillary angiomatosis is characterized by the proliferation of blood vessels, resulting in them forming tumor-like masses in the skin and other organs. Symptoms vary depending on which parts of the body are affected; for example, those whose livers are affected may have an enlarged liver and fever, while those with osseous BA will experience intense pain in the affected area. These lesions may take several forms such as papules or nodules and plaque.
    • Bacillary angiomatosis (BA) is a bacterial infection caused by either Bartonella henselae or Bartonella quintana.
    • BA responds dramatically to several antibiotics. Usually, erythromycin will cause the skin lesions to gradually fade away in the next four weeks, resulting in complete recovery. Doxycycline may also be used. However, if the infection does not respond to either of these, the medication is usually changed to tetracycline.
    • To learn more about bacillary angiomatosis, click here.

Locally aggressive or borderline vascular tumors

Kaposiform hemangioendothelioma

  • Locally Aggressive tumor that originates on skin and occurs primarily in childhood.[131] It is characterized by a single or multiple masses with following characteristics:
    • Deep reddish-purple color
    • Shiny, firm texture
    • Warm to the touch
    • Swollen and painful
  • May be complicated by Kasabach-Merritt phenomenon (KMP), characterized by consumption coagulopathy, thrombocytopenia, and hemolytic anemia.[132] Typical features also include low fibrinogen and elevated D-dimers.
  • Somatic activating GNA14 c.614A>T (p.Gln205Leu) mutations have been found in some KHE.[27]
  • Invasion of bone, retroperitoneum, and mediastinum has occured in some cases but no case of metastasis has been reported yet. [132]
  • Diagnostic work up may include blood tests, biopsy, contrast enhanced ultrasound and MRI or CT scan imaging.
  • Treatment Options include steroid, vincristine, interferon alpha, anti-platelet agents, sirolimus-containing therapies and surgery.[133]

Retiform hemangioendothelioma

  • First described in 1994 as a form of low grade angiosarcoma, Retiform hemangioendothelioma commonly presents as a slow growing asymptomatic solitary nodule or plaque on distal extremities in 2nd-4th decade of life.[134]
  • Must be differentiated from Angiosarcoma.
  • High level of local recurrence but very low potential for metastasis.
  • Diagnostic work up includes histopathological studies, that shows arborizing blood vessels are arranged in retiform pattern [134], and MRI.
  • Surgery is the treatment of choice, though 2/3rd cases recur. Adjuvant radiotherapy and ddjuvant chemotherapy with recombinant interferon alpha and low dose cisplatin have also been reported in selected cases. [134]

Papillary intralymphatic angioendothelioma (PILA), Dabska tumor

  • First described in 1969 by Dabska,this rare vascular neoplasm generally occurs in soft tissues but can also occur in bone. They usually appear as painless inflammatory irregular or nodular lesions below the skin surface.
  • The distinctive feature on histopathology is the intravascular growth of well-differentiated endothelial cells presenting as a matchstick columnar configuration.[135]
  • They are locally aggressive but rarely metastasize. Locally recurrence after surgery is very common.
  • Diagnostic studies may include histopathological studies, fine needle aspiration, MRI and Ct scan.[136]
  • Wide local excision is the treatment of choice. However any combination of steroids, chemotherapy, radiation therapy, and invasive procedures can be used to treat this tumor.[137]

Composite hemangioendothelioma

  • A rare vascular neoplasms, characterized by an admixture of benign, low-grade malignant, and malignant vascular components, the ratio of each component can vary. They can occur in any age group.[138]
  • They occur predominantly as long-standing lesions in the dermis and subcutis of the extremities, but can also occur at other sites, including the oral cavity and in viscera such as kidney and spleen.[139]
  • It may recur locally and has the potential to metastasize. Recurrence was found to be in 8/10 cases in some studies. [140]
  • Diagnostic work up must include biopsy because of heterogeneity of lesions and it must be differentiated from other vascular tumors.[138]
  • Surgical excision is the treatment of choice although some patients have been treated with interferon and electron beams.[138]

Pseudomyogenic hemangioendothelioma

  • A locally aggressive tumor with endothelial differentiation that usually presents as multiple asymptomatic discontinuous lesions, often at extremities.[141][142]
  • SERPINE1-FOSB fusions are characteristic that result in over-expression of truncated form of FOSB.[141] FBJ murine osteosarcoma viral oncogene homolog B, also known as Finkel-Biskis-Jinkins murine osteosarcoma viral oncogene homolog B, FOSB or FosB, is a protein that, in humans have been implicated as regulators of cell proliferation, differentiation, and transformation.[143]
  • It may mimic epithelioid sarcoma on histology but metastasis is very rare and prognosis is excellent.[142]
  • Diagnostic work up includes X-ray, MRI, CT scan and biopsy of the lesion.
  • Excision is the typical treatment but chemotherapeutic agents including gemcitabine/taxane and mammalian target of rapamycin inhibitor [144], mTOR inhibitors such as sirolimus [145], VEGFR1-4/PDGFRA inhibitors such as telatinib [141] have been used with success in various studies.

Polymorphous hemangioendothelioma

  • A rare vascular neoplasm, Polymorphous hemangioendothelioma occurs in lymph nodes, but a few cases have been found in extra-nodal sites such as the mediastinum, spinal cord, and liver. It is a very rare cause of persistent lymphadenopathy. The data on natural history and clinical presentation is limited due to very few number of cases reported. [146]
  • Characterized by a polymorphous blend of solid, primitive vascular and angiomatous areas in varied proportions on microscopic examination.[146]
  • Diagnotic work up includes histopathological examination, MRI and Ct scan.
  • Wide local excision[147] has been used for treatment, with radiation therapy in case of recurrence.[148]

Kaposi sarcoma

  • An AIDS-associated vascular malignancy that usually presents as mucocutaneous lesions [149] but can also occur in viscera such as lungs. It can remain confined to skin but widespread visceral involvement may occur.
  • There are three known variants
    • One variant occurs spontaneously in Jewish and Italian males in Europe and the United States.
    • Another more aggressive variant is endemic in young children is endemic in Africa.
    • A third form occurs in about 0.04% of kidney transplant patients. There is also a high incidence in AIDS patients.[150] HHV-8 is the suspected cause.[151]
  • To learn more about KS, click here.

Malignant vascular tumors

Angiosarcoma

  • Angiosarcoma(AS) is malignancy that presents with a very heterogeneous distribution in the human body with aggressive clinical course, and may appear in multiple locations, from breast to liver or skin.[152]
  • Associated with MYC gene amplification and protein overexpression.[153] Myc is a family of regulator genes and proto-oncogenes that code for transcription factors.
  • Complete surgical excision and radiotherapy are the main treatments, with a minor role of chemotherapy.[154]
  • To learn more about angiosarcoma click here.

Epithelioid hemangioendothelioma

  • A rare vascular tumor, described for the first time in 1975 by Dail and Liebow,that usually affects lung, liver and bones, although may occur many other sites in body including head and neck, breasts and lymph nodes.[155]
  • Usually Asymptomatic but patient may present with respiratory symptoms, bone pains or other symptoms depending on the site of the tumor.
  • Majority are characterized by a reciprocal t(1;3)(p36;q25) translocation. The t(1;3) results in fusion of a gene known as WWTR1 (or TAZ) to CAMTA1. These genes code for transcription factors.[156][157]
  • Imaging is crucial in forming both diagnosis and management plan. Recognition of the expression of vascular markers (Fli-1 and CD31 are endothelial-specific markers), and the microscopic evidence of vascular differentiation is of primary importance as well.[155]
  • Surgery has been used as primary treatment modality depending upon the location of the tumor, with radiotherapy being used in some cases.

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