Lateral radiograph (A) of the distal femur revealing a lytic lesion involving the metaphysis along with its calcification. There is cortical thickening and reactive periosteal changes. A coincidental traumatic fracture is seen above. Anteroposterior radiograph (B) of the left proximal humerus showing a large calcified tumour extending well down the medullary canal. Anteroposterior radiograph (C) of the right distal femur and knee joint showing a lytic destructive lesion with cortical thickening and marked bone destruction. Lateral view (D) showing the lytic destructive lesion. Anteroposterior (E) and lateral (F) views of a left proximal femoral chondrosarcoma. A large calcified lesion is evident with significant soft tissue extension.