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Myositis ossificans - Thigh - X-ray
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Myositis ossificans - Thigh - X-ray
  • Case ID: 395
  • Diagnosis: Myositis ossificans
  • Category: Pseudotumors
  • Category Type: Myositis ossificans
  • Category Sub Type: Benign
  • Location: Thigh
  • Age: 12
  • Sex: F
  • Treatment: Resection
  • Image ID: 2698
  • Image Type: X-ray
  • Images relating to this case: 2698, 2699 , 2700 , 2701 , 2702 .

A 12-year-old girl gave a vague history of an injury to her thigh while riding horses. This radiograph of the proximal thigh shows a heavily calcified or ossifying soft tissue lesion arising from the inner aspect of the proximal femur in the adductor compartment with the heaviest calcification seen at the periphery of the lesion and the more lucent area seen centrally. This is the typical "zonal" pattern of traumatic myositis ossificans. It is not unusual for myositis ossificans to attach to the adjacent involved bone. Here there is even a periosteal response giving the appearance of a parosteal osteogenic sarcoma that has a similar pattern but with a reverse zonal pattern with heavy calcification in the central area of the lesion and a more lucent area at the periphery.


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