An unusual lesion in the femur.
D000328:Adult; D000783:Aneurysm / Q000473:pathology; D001845:Bone Cysts / Q000000981:diagnostic imaging / Q000473:pathology*; D003937:Diagnosis, Differential; D005270:Femur Head / Q000000981:diagnostic imaging / Q000473:pathology*; D005354:Fibrosarcoma / Q000175:diagnosis; D006801:Humans; D008297:Male; D012516:Osteosarcoma / Q000175:diagnosis; D011859:Radiography