Which radiographic sign is a buzz word for Ewing sarcoma?

Which radiographic sign is a buzz word for Ewing sarcoma?

• A. Sunburst pattern
• B. Hair on end
• C. Onion-skin periosteal reaction
• D. Parallel periosteal reaction

Answer: (B)

The key radiographic feature for Ewing sarcoma is an onion-skin periosteal reaction. This layered, laminated buildup of new bone around the cortex reflects rapid, repetitive periosteal elevation as the tumor grows quickly. It’s a hallmark pattern associated with Ewing rather than with other bone tumors, and it can be accompanied by a soft-tissue mass. Sunburst periosteal reaction, by contrast, points toward osteosarcoma, with radial spicules radiating from the cortex. Hair-on-end describes a skull appearance seen with marrow expansion disorders like beta-thalassemia and is not a characteristic sign of Ewing. Parallel periosteal reaction can occur with less aggressive or chronic processes and does not capture the rapid, laminated layering typical of Ewing.

The key radiographic feature for Ewing sarcoma is an onion-skin periosteal reaction. This layered, laminated buildup of new bone around the cortex reflects rapid, repetitive periosteal elevation as the tumor grows quickly. It’s a hallmark pattern associated with Ewing rather than with other bone tumors, and it can be accompanied by a soft-tissue mass.

Sunburst periosteal reaction, by contrast, points toward osteosarcoma, with radial spicules radiating from the cortex. Hair-on-end describes a skull appearance seen with marrow expansion disorders like beta-thalassemia and is not a characteristic sign of Ewing. Parallel periosteal reaction can occur with less aggressive or chronic processes and does not capture the rapid, laminated layering typical of Ewing.