What is your diagnosis? Radiation-induced osteosarcoma.
The initial roentgenogram obtained in 1969 exhibits a Ewing's sarcoma of the distal left femur. The patient was subsequently treated with radiotherapy. The follow-up films obtained five years later show evidence of an osteosarcoma in the previously treated area.
D005266:Femoral Neoplasms / Q000000981:diagnostic imaging*; D006801:Humans; D009381:Neoplasms, Radiation-Induced / Q000000981:diagnostic imaging*; D012516:Osteosarcoma / Q000000981:diagnostic imaging* / Q000209:etiology; D011859:Radiography; D012512:Sarcoma, Ewing / Q000532:radiotherapy