Chondrosarcoma

Description: Clinical presentation: 54 year old man with pain in the left hip.
There is a lytic lesion of the neck and metaphysis of the left femur. Its superior margin appears fairly well-defined and the lesion is crossed by many strands of bone, giving a multiloculate appearance. The overlying gluteal fat planes are undisturbed, but lie posteriorly. Inferiorly the zone of transition between normal and abnormal bone is wider. The elesion extends into the greater trochanter, where the ligamentous attachments have reduced the lammellar periosteal reaction that is extensive below over the proximal femoral diaphysis on its lateral side.