Musculoskeletal Imaging

Onion-peel pattern

a radiographic abnormality occurring after an exuberant periosteal response, such as occurs in Ewings sarcoma, periostitis, osteomyelitis or bone tumours, such as osteosarcoma. This appearance results from the presence of multiple layers of new bone. Concentric layers of laminated new bone occur, which possibly represent alternating periods of slow and rapid growth.