Case report 142

An example of a rarely encountered but important variant of osteosarcoma has been presented and the entity discussed. It is important that radiologists, orthopedic clinicians and pathologists recognize the characteristics of periosteal osteosarcoma both histologically and radiologically. It is particularly important that this lesion be distinguished from parosteal osteosarcoma and chondrosarcoma. It also must be stressed that the prognosis in periosteal osteosarcoma is distinctly better than for classical osteosarcoma and not quite as good as for parosteal osteosarcoma. (orig./MG)