angiosarcoma

noun, plural an·gi·o·sar·co·mas, an·gi·o·sar·co·ma·ta [an-jee-oh-sahr-koh-muh-tuh] /ˌæn dʒi oʊ sɑrˈkoʊ mə tə/. Pathology.

1. malignant overgrowth of vascular tissue.

n.

1. A rare malignant tumor occurring most often in the breast and skin and believed to originate from the endothelial cells of blood vessels.