A benign or malignant tumor arising from endothelial cells that line blood vessels and lymphatic vessels.
From endothelial + -oma (Greek 'tumor'). Medical term established in oncology by early 1900s.
Hemangioendotheliomas are a special kind of endothelioma that sometimes shrink or even disappear without treatment—making them unique among cancers and offering hope to patients!
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