POSTRADIATION OSTEOSARCOMA OF THE SCAPULA

Osteosarcomas arising in irradiated tissues are uncommon but important complications of radiotherapy. Radiation-induced osteosarcomas genera lly occur 3-30 years after exposure and are most common after radiothe rapy for cervical or breast carcinoma. These tumors are usually rapidl y growing, extremely painful, and histologically high grade. In this p aper, we report two cases of high-grade post-radiation osteosarcoma of the scapula. Despite being almost identical radiologically and pathol ogically, one case had a typical clinical presentation whereas the sec ond case had two unusual features. being non-painful and arising in a field initially irradiated for bronchogenic carcinoma.