An unusual sarcoma arising in a solitary osteochondroma.
D000293:Adolescent; D000671:Amputation, Surgical; D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D005096:Exostoses / Q000473:pathology* / Q000601:surgery; D005260:Female; D005354:Fibrosarcoma / Q000473:pathology* / Q000601:surgery; D006801:Humans; D007717:Knee / Q000601:surgery; D011230:Precancerous Conditions; D011859:Radiography; D013977:Tibia / Q000473:pathology* / Q000601:surgery