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What is Histology of Myositis ossificans mimics - and explain in detail?
Histologically myositis ossificans mimics osteosarcoma.
They can be differentiated by zone phenomenon :-

Osteogenic sarcoma → Central zone contains mature cells and peripheral zone contains more active immature cells.
Myositis ossificans → Central zone contains active immature cells and peripheral zone contains more mature cells.