Codman's Triangle

Codman's Triangle is a radiological finding often associated with certain types of bone tumors, particularly osteosarcoma. It appears as a triangular area of new bone formation at the edge of an old bone, indicating that the tumor is pushing against the surrounding bone and causing a reaction. This triangle usually forms where the tumor breaks through the cortex, or outer layer, of the bone. In medical imaging, it serves as a significant clue to help doctors identify aggressive bone lesions, aiding in the diagnosis and treatment planning for patients with suspected bone tumors.