Hemangioendothelioma

**Semantic type:** Neoplastic Process

**Definition:** A vascular proliferation characterized by the presence of prominent endothelial cells and the formation of vascular channels. Hemangioendotheliomas may display borderline or low grade characteristics.

**Synonyms:** - Angioendothelioma - Angioendothelioma - Hemangioendothelioma, NOS