Metaphyseal multifocal osteosarcoma.

Two patients, aged six and eight years, having metaphyseal osteolytic and osteoblastic multifocal osteosarcoma are described. The condition is named "metaphyseal multifocal osteosarcoma". The metaphyseal areas are the sites of the pathological process. It can be postulated that a certain intensity of growth activity is the predominant factor in this condition and that this accounts for its multicentered presentation.