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Codman's triangle

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Codman's triangle is the radiographic appearance of the rim of new subperiosteal bone which forms when a lesion such as a tumour lifts the periosteum away from the bone.

The small triangle of bone is seen at the advancing margin of the lesion.

The three main causes for a Codman's triangle are:

  • osteosarcoma
  • Ewing's sarcoma
  • subperiosteal abscess

Layering of the new bone may result in an "onion skin" appearance.


General Practice Notebook
General Practice Notebook
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