Telangiectatic Osteosarcoma

**Semantic type:** Neoplastic Process

**Definition:** An osteosarcoma usually arising from the metaphysis of long bones. It is characterized by the presence of a cystic architecture with blood-filled spaces. The prognosis is similar to that of conventional osteosarcoma.

**Synonyms:** - Malignant Bone Aneurysm - Telangiectatic Osteogenic Sarcoma - Telangiectatic osteosarcoma