A rare cancer or tumor arising from endothelial cells, the cells lining blood vessels.
From endothelial + -oblastoma (Greek blastos 'germ' + oma 'tumor'). Medical term from 20th-century oncology.
Hemangioendotheliomas are tumors that grow from blood vessel lining cells—some mysteriously shrink on their own as patients age, making them one of cancer's strangest mysteries!
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