<prompt> The X-ray of the right distal tibia and fibula is shown, which possibly represent :Ewings sarcomaOsteosarcomaSoft tissue tumor with fibular involvementOsteoclastoma  <response>: Lesion involving distal fibula with typical sun burst periosteal reaction and adjacent soft tissue swelling is noted, this is diagnostic of osteosarcoma. X-ray of osteosarcoma shows the following features : An area of irregular destruction in the metaphysis, sometimes overshadowed by the new bone formation. Periosteal reaction Codmans triangle Sun-ray appearance 