[An unusual case of clear-cell chondrosarcoma with intrasynovial tumoral localization]

A case of a clear-celled chondrosarcoma of the femoral condyle extending into the knee joint is reported. At operation, many nodules looking like benign osteochondromata were found. They were found to be due to dissemination of the chondrosarcoma. An electron-microscopic study showed that the matrix was different in the osseous tumour from that in the synovial nodules. The result was satisfactory five years after resection followed by arthrodesis.