Hiba Saleemover 3 years ago

Codman Triangle - A Radiologic Sign

Codman triangle is a radiologic sign which appears as a triangular area of new subperiosteal bone. It shows up if any lesion, such as a tumor, lifts the periosteum away from the bone. Hence, it's a clinically significant sign as it indicates an underlying bone lesion. Usually the lesion is an aggressive one like a tumor and the most common causative tumor is osteosarcoma. Ewing sarcoma, chondrosarcoma and malignant giant cell tumor are other examples. Rarely, non-cancerous lesions might also cause it like osteomyelitis, trauma or even a hematoma.