Mediastinal Extraskeletal Osteosarcoma

**Semantic type:** Neoplastic Process

**Definition:** An osteosarcoma arising from the mediastinum.

**Synonyms:** - Mediastinal Osteogenic Sarcoma - Mediastinal Osteosarcoma - Osteogenic Sarcoma of Mediastinum - Osteogenic Sarcoma of the Mediastinum - Osteosarcoma of Mediastinum - Osteosarcoma of the Mediastinum