Dr.Sanaalmost 7 years ago

Codman's triangle

Codman 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.  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. 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.