FINAL DIAGNOSE- CASE NO. (FB AND INSTA ) (Myelitis Ossificans ) This lateral elbow X-ray shows a well-defined, rounded, calcified mass in the soft tissue anterior to the distal humerus and not attached to the bone. The characteristic zonal pattern of ossification —with a more radiolucent center and denser peripheral ossification—supports the diagnosis of: Myositis Ossificans ✅ Key Radiological Features: Location : Soft tissue ( commonly post-traumatic ), not arising from bone. Zonal ossification : Peripheral mature bone with central lucency. Well-circumscribed lesion . No cortical destruction or periosteal reaction , helping to differentiate it from aggressive neoplasms like osteosarcoma. 🧠 Important Differentials: Osteosarcoma : Irregular margins, bone destruction, and central ossification (opposite of MO). Soft tissue sarcoma with calcification : Less organized...
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