High-grade surface osteosarcoma of the rib - a case report.

Surface osteosarcomas refers to tumors originating from the surface of bone primarily connected with the periosteum. Approximately 1- 2% of osteosarcomas are located in thoracic bones. These tumors are characterized by wide range of radiologic, morphologic and histologic presentation, mainly affects patients in the second and third decade of life and has very poor prognosis. According to the current WHO classification of OS one of this kind of tumor is highgrade surface osteosarcoma which accounts for 0,4% of all OS cases.