Periosteal osteosarcoma.
D001859:Bone Neoplasms / Q000000981:diagnostic imaging*; D002812:Chondroma / Q000000981:diagnostic imaging; D002813:Chondrosarcoma / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D006801:Humans; D012516:Osteosarcoma / Q000000981:diagnostic imaging*; D010521:Periosteum / Q000000981:diagnostic imaging; D011859:Radiography