Ewing sarcoma radiographic feature?

Ewing sarcoma radiographic feature?

• A. Onion-skin periosteal reaction
• B. Sunburst periosteal reaction
• C. Codman triangle
• D. Ground-glass opacity

Answer: (A)

The main radiographic pattern for Ewing sarcoma is an aggressive periosteal reaction that forms onion-skin layers. This onion-skin appearance happens because the periosteum is stimulated repeatedly as the tumor grows beneath it, producing multiple thin concentric sheets of new bone over the cortex. It’s a rapid, layered response that is a classic clue in younger patients with a diaphyseal bone lesion. To contrast, a sunburst pattern reflects osteosarcoma with radiating spicules of new bone, while a Codman triangle is a triangular area of subperiosteal new bone seen in aggressive lesions like osteosarcoma. Ground-glass opacity isn’t typical of Ewing and is more associated with conditions such as fibrous dysplasia.

The main radiographic pattern for Ewing sarcoma is an aggressive periosteal reaction that forms onion-skin layers. This onion-skin appearance happens because the periosteum is stimulated repeatedly as the tumor grows beneath it, producing multiple thin concentric sheets of new bone over the cortex. It’s a rapid, layered response that is a classic clue in younger patients with a diaphyseal bone lesion.

To contrast, a sunburst pattern reflects osteosarcoma with radiating spicules of new bone, while a Codman triangle is a triangular area of subperiosteal new bone seen in aggressive lesions like osteosarcoma. Ground-glass opacity isn’t typical of Ewing and is more associated with conditions such as fibrous dysplasia.