Periosteal osteosarcoma: It arises from the inner germinative layer of periosteum. Cytologic grade of this tumour is higher than parosteal osteosarcoma and lower than conventional osteosarcomas, so it is considered as intermediate grade osteosarcoma. It predominantly contains chondroid matrix. Periosteal osteosarcomas are rare cartilage-rich bone tumours characterized by a juxtacortical eccentric position and are normally regarded oncologically as of intermediate to high grade.
Related Journal: Journal of Sarcoma, European Journal of Cancer, Current Orthopaedic Practice