<prompt> Myositis - Ossificans common atShoulder joiniElbow jointKnee jointHipjoiiu  <response>: B. i.e. Elbow joint 599 - Apley 8th 369 - current Diagnosis and Treatment 4th Myositis - ossificans Post- traumatic ossification Ossification of the haematoma around a joint resulting in the formation of a mass of bone restricting joint movements often completely Common at elbow joints stress- reactive pseudo tumor Myositis ossificans histologically resembles to osteogenic sarcoma Quadriceps muscle is commonly involved With maturation, ossification occurs in the traumatized muscle facial planes. Which may suggest the diagnosis of a synovial sarcoma or other calcifying sarcoma. If the myositis pseudotumor is attached to the subjacent bone. It can mimic a parosteal osteosarcoma 