Retiform hemangioendothelioma
Encyclopedia
Retiform hemangioendothelioma (also known as a "Hobnail hemangioendothelioma") is a low-grade angiosarcoma
Angiosarcoma
Angiosarcoma is a malignant neoplasm of endothelial-type cells that line vessel walls. This may be in reference to blood or lymphatic vessels ....

, first described in 1994, presenting as a slow-growing exophytic mass, dermal plaque, or subcutaneous nodule.
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