<prompt> A patient has history of A 2 years back; at the same sight he developed pain and swelling. X - ray shows the following features. What will be the diagnosis?Osteogenic sarcomaEwings sarcomaChronic osteomyelitisMultiple myeloma  <response>: X-ray shows a deformed bone with holescavities in the bone. Chronic Osteomyelitis: Its characteristic feature is sequestrum dead bone in a cavity with involucrum live bone around it. There is discharge of pus draining through cloacae and track sinuses in the cavity. Osteosarcoma: aggressive tumor, there will be no history of trauma and there will be presence of growth coming out. There may be Codmans triangle and sunburst appearance in x-rays. Ewings sarcoma: found in diaphysis and will be in younger people. History of trauma is not significant. Radiographically, periosteal reaction of onion-skin appearance is present. Multiple myeloma: usually found in elderly and there will be no history of trauma. X-rays shows osseous lesions which in long bones usually affects the metaphysis. 