Sarcoma

Sarcoma, form of tumor derived from connective tissue, usually of mesodermal origin in embryology. It is often distinguished from cancer because its behavior and natural history may differ, although it is still a malignant tumor. It commonly arises from bone (osteosarcoma), fibrous tissue (fibrosarcoma), or cartilage (chondrosarcoma). Excision is required, though radiation therapy may be helpful.