Myositis Ossificans - Morphology

Comments:
Myositis Ossificans (MO) - Overview of the Zonal Pattern: The zonal pattern is an important diagnostic clue for myositis ossificans (MO) and is well-established by 3-4 weeks after onset. This image shows innermost zone with fibroblastic/myofibroblastic proliferation on the right, intermediate zone with immature woven bone in the middle and peripheral zone with mineralized lamellar bone on the left.