hemangioendothelioma /hēman′jē·ō·en′dōthē′lē·ō″mə/ pl. hemangioendotheliomas, hemangioendotheliomata [Gk, haima + endon, inside, thele, nipple, oma, tumor] , 1. 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. Also called angioendothelioma. 2. malignant hemangioendothelioma. See also angiosarcoma.
