myositis ossificans


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  • Clinical

    • age: usually young adult
    • location: elbow, thigh, buttock, shoulder
    • hx of soft tissue injury

  • Histology

    • bone elements: fibroblasts, bone
    • fibroblasts
    • stroma: myxoid, edema, vascular, extravasated RBCs

  • Stains

    • vimentin+
    • osteoblasts and osteocytes also express osteocalcin
    		•