[Semimalignant bone tumors (author's transl)].

Semimalignant bone tumors are characterized by local destructive and invasive growth and the tendency to recur. Haematogenous metastases are exceptional or a late manifestaion. Typical examples of semimalignancy are giant-cell tumors, large chondromas of the pelvis, and recurrent chondromas in any location. The treatments of choice are resection or amputaion.