The Codman triangle (previously referred to as Codman's triangle) is the triangular area of new subperiosteal bone that is created when a lesion, often a tumour, raises the periosteum away from the bone.[1] A Codman triangle is not actually a full triangle. Instead, it is often a pseudotriangle on radiographic findings, with ossification on the original bone and one additional side of the triangle, which forms a two sided triangle with one open side. This two sided appearance is generated due to a tumor (or growth) that is growing at a rate which is faster than the periosteum can grow or expand, so instead of dimpling, the periosteum tears away and provides ossification on the second edge of the triangle.[2] The advancing tumour displaces the periosteum away from the bone medulla. The displaced and now lateral periosteum attempts to regenerate underlying bone. This describes a periosteal reaction.[citation needed]
The main causes for this sign are osteosarcoma, Ewing's sarcoma, eumycetoma, and a subperiosteal abscess.[3][4]
^"Codman's triangle - General Practice notebook". gpnotebook.com. January 2018. Archived from the original on 2022-10-26. Retrieved 2022-10-26.
^"Periosteal Reaction". UW Radiology. Archived from the original on 2022-10-26. Retrieved 2022-10-26.
^Hide, Geoff (April 19, 2018). "Imaging in Classic Osteosarcoma: Practice Essentials, Radiography, Computed Tomography". Medscape. Archived from the original on October 26, 2022. Retrieved October 26, 2022.
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