hemangioendothelioma


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hemangioendothelioma

 [he-man″je-o-en″do-the″le-o´mah]
a rare, well-differentiated endothelial tumor with an appearance between that of a hemangioma and a sarcoma; sometimes considered to be identical to a hemangiosarcoma.

he·man·gi·o·en·do·the·li·o·ma

(hē-man'jē-ō-en'dō-thē'lē-ō'mă),
A neoplasm derived from blood vessels, characterized by numerous prominent endothelial cells that occur singly, in aggregates, and as the lining of congeries of vascular tubes or channels; in the elderly, may be malignant (angiosarcoma or hemangiosarcoma), but in children are benign and probably represent a growing stage of capillary hemangioma. Locally invasive but only rarely metastasize.
[hemangio- + endothelium + G. -oma, tumor]

hemangioendothelioma

/he·man·gio·en·do·the·lio·ma/ (-en″do-the″le-o´mah)
1. a true neoplasm of vascular origin, with proliferation of endothelial cells around the vascular lumen.

hemangioendothelioma

[hēman′jē·ō·en′dōthē′lē·ō′mə] pl. hemangioendotheliomas, hemangioendotheliomata
Etymology: Gk, haima + endon, inside, thele, nipple, oma, tumor
1 also called angioendothelioma. a tumor, consisting of endothelial cells, that grows around an artery or a vein. The benign form occurs in children and is usually cured by local excision. The tumor rarely becomes malignant.
2 malignant hemangioendothelioma. See also angiosarcoma.

he·man·gi·o·en·do·the·li·o·ma

(hē-man'jē-ō-en'dō-thē'lē-ō'mă)
A neoplasm derived from blood vessels, characterized by numerous prominent endothelial cells that occur singly, in aggregates, and as the lining of congeries of vascular tubes or channels; in the elderly, may be malignant (angiosarcoma or hemangiosarcoma), but in children are benign and probably represent a growing stage of capillary hemangioma.
Synonym(s): haemangioendothelioma.

he·man·gi·o·en·do·the·li·o·ma

(hē-man'jē-ō-en'dō-thē'lē-ō'mă)
A neoplasm derived from blood vessels, characterized by numerous prominent endothelial cells that occur singly, in aggregates, and as the lining of congeries of vascular tubes or channels; in the elderly, may be malignant (angiosarcoma or hemangiosarcoma), but in children are benign.
Synonym(s): haemangioendothelioma.

hemangioendothelioma

a hemangioma in which endothelial cells are the predominant component.

malignant hemangioendothelioma
References in periodicals archive ?
Lastly, hemangioendotheliomas have variable histology and may contain necrosis or hemorrhage.
Functional hyposplenism due to a primary epithelioid hemangioendothelioma of the spleen.
The diagnosis is primarily made by way of USG and MRI in cases of infantile hepatic hemangioendothelioma (IHH).
Bartonella species bacteremia in two patients with epithelioid hemangioendothelioma.
16 Distinction from epithelioid hemangioendothelioma was made by the lesion's architecture and the presence of prominent inflammation and numerous well-formed blood vessels, with a lack of extravascular proliferation of epithelioid neoplastic cells.
The final diagnosis was confirmed to be hemangioendothelioma by immunohistochemistry study of the paraffin-embedded surgical tissue block, which was positive for CD31 and vimentin, and negative for CD34, cytokeratin (CK), epithelial membrane antigen (EMA), smooth muscle actin (SMA), desmin, HMB-45, WT-1, and calretinin.
Vascular endothelial growth factor receptor-3 (VEGFR-3): a marker of vascular tumors with presumed lymphatic differentiation, including Kaposi's sarcoma, kaposiform and Dabska-type hemangioendotheliomas, and a subset of angiosarcomas.
MRI scan of the abdomen showed multiple liver lesions consistent with hemangioendothelioma.
Hannah, now 19 months, suffers from Kaposiform hemangioendothelioma with Kasabach-Merritt syndrome - which means tumours make platelet level drop dangerously low.
Studies have demonstrated that LCA has two subtypes with potentially malignant properties, littoral cell angiosarcoma (11) and littoral cell hemangioendothelioma.
He was born with a benign tumour - a mass of blood vessels called a hemangioendothelioma - which, although not cancerous, took blood away from his other organs and put huge pressure on his heart.
Kasabach-Merritt syndrome (KMS) is characterized by consumption coagulopathy (thrombocytopenia, anemia, hyporibrinogenemia, and high D-dimer level), angioma, and kaposiforrn hemangioendothelioma (1-3).