A neoplasm derived from blood vessel s, 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. [hemangio- + endothelium + G. -oma, tumor]
- h. tuberosum multiplex an eruption of pinkish papules, caused by hyperplasia of the endothelium of the superficial blood vessel s.

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he·man·gio·en·do·the·li·o·ma or chiefly Brit hae·man·gio·en·do·the·li·o·ma -jē-ō-.en-dō-.thē-lē-'ō-mə n, pl -mas also -ma·ta -mət-ə an often malignant tumor originating by proliferation of capillary endothelium

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he·man·gio·en·do·the·lio·ma (he-man″je-o-en″do-the″le-oґmə) [hemangioma + endothelioma] a true neoplasm of vascular origin, characterized by proliferation of endothelial cells in and about the vascular lumen; it is usually considered to be intermediate in grade between hemangioma and hemangiosarcoma but sometimes is used to denote the latter.

Medical dictionary. 2011.

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