Codman triangle periosteal reaction
A Codman triangle is a type of periosteal reaction seen with aggressive bone lesions. With aggressive lesions, the periosteum does not have time to ossify with shells of new bone (e.g. as seen in single layer and mulitlayered periosteal reaction), so only the edge of the raised periosteum will ossify.
The Codman triangle may be seen with aggressive lesions :
- osteosarcoma
- Ewing sarcoma
- osteomyelitis
- active aneurysmal bone cyst
- giant cell tumour
- metastasis
- chondrosarcoma (especially juxtacortical chondrosarcoma)
- malignant fibrous histiocytoma
Etymology
First described by Ribbert in 1914 2
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