Pediatric Myositis Ossificans

  • Etiology: inflammatory pseudotumor of skeletal muscle due to trauma
  • Imaging: zone phenomenon with center being fibroelastic, periphery being osteoblastic, rim being calcified, surrounding edema
  • MRI: in early phase see peripherally isointense T1 signal and hyperintense T2 signal and enhancement corresponding to peripheral osteoid matrix, in late phase after 8 weeks see peripherally hypointense T1 signal and hypointense T2 signal and no enhancement

Radiology Cases of Myositis Ossificans

Radiograph of myositis ossificans
AP (left) and lateral (right) radiographs of the femur show an amorphous area of calcification anterior and lateral to the femur.