Which periosteal reaction is seen with infection?

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Multiple Choice

Which periosteal reaction is seen with infection?

This question tests how the periosteum responds to aggressive processes like infection. When infection, such as osteomyelitis, drives rapid inflammation, pus and edema lift the periosteum away from the bone quickly. The new bone can only form at the advancing edge, creating a triangular spur visible on the radiograph—the Codman triangle. This pattern signals a fast, aggressive reaction and is classically associated with infection as well as certain malignant lesions. A solid periosteal reaction indicates a slower, less aggressive process, while laminated (onion-skin) patterns are more typical of other conditions like Ewing sarcoma. Hence, the periosteal reaction seen with infection is Codman triangle.

This question tests how the periosteum responds to aggressive processes like infection. When infection, such as osteomyelitis, drives rapid inflammation, pus and edema lift the periosteum away from the bone quickly. The new bone can only form at the advancing edge, creating a triangular spur visible on the radiograph—the Codman triangle. This pattern signals a fast, aggressive reaction and is classically associated with infection as well as certain malignant lesions. A solid periosteal reaction indicates a slower, less aggressive process, while laminated (onion-skin) patterns are more typical of other conditions like Ewing sarcoma. Hence, the periosteal reaction seen with infection is Codman triangle.

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