Orbital Bone Epithelioid Hemangioendothelioma

**Semantic type:** Neoplastic Process

**Definition:** A low-grade malignant blood vessel neoplasm that arises from an orbital bone. It is characterized by the presence of epithelioid endothelial cells. The neoplastic cells are arranged in cords and nests that are embedded in a myxoid to hyalinized stroma.