endothelioblastoma

en·do·the·lio·blas·to·ma (en″do-the″le-o-blas-toґmə) [endothelium + blastoma] a tumor derived from primitive vasoformative tissue with formation of usually small and slitlike vascular spaces lined by prominent endothelial cells; the term, which now includes hemangioendothelioma, angiosarcoma, lymphangioendothelioma, and lymphangiosarcoma, was applied formerly to such tumors arising from mesothelial tissue as well.