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1 From the Department of Radiology, Jefferson Medical College Hospital, Philadelphia, Pennsylvania
1. Periosteal reactions occur in a variety of bone diseases and may be useful in differentiating among these conditions.
2. Solid reactions are seen in benign conditions and are useful in differentiating eosinophilic granuloma and osteoid osteoma from malignant bone tumors (Ewing's tumor).
3. Interrupted periosteal reactions are common in active, progressive disease which may be either neoplastic or inflammatory. The lamellated type is associated with both neoplasm and infection, while the perpendicular type is more common in neoplastic conditions and rare with infection.
4. Codman's triangle is due to elevation of the periosteum and not necessarily to malignancy.
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