Extraosseous osteogenic sarcoma.
D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007866:Leg; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D009364:Neoplasm Recurrence, Local; D012516:Osteosarcoma / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery; D011859:Radiography; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D013848:Thigh