New aspects in the treatment of bone sarcomas.

The author reports on the progress made in the treatment of bone tumours in the last two decades. There is a short description of new entities like the solid form of aneurysmal bone cyst; dedifferentiated and clear-cell chrondrosarcoma; low malignant central osteosarcoma; periosteal and high-grade surface osteosarcoma, which have recently been reported in the literature. The response to the chemotherapy in osteosarcoma and the problems of limb-saving surgery in bone tumours are discussed.