Which tumor would you most expect to see a sunburst radiographic sign?

Which tumor would you most expect to see a sunburst radiographic sign?

• A. Osteosarcoma
• B. Chondrosarcoma
• C. Ewing sarcoma
• D. Rhabdomyosarcoma

Answer: (A)

Sunburst periosteal reaction reflects rapid periosteal new bone formation driven by an aggressive, bone-forming tumor. Osteosarcoma is classically associated with this pattern because malignant osteoblasts produce osteoid that lifts the periosteum and lays down radiating spicules of bone, creating the starburst appearance on X-ray. This tumor typically arises in adolescents and young adults, often in the metaphysis of long bones around the knee (distal femur or proximal tibia). By contrast, Ewing sarcoma more often shows onion-skin layering of periosteal reaction, chondrosarcoma tends to have cartilaginous matrix calcifications, and rhabdomyosarcoma is primarily a soft-tissue tumor with less typical sunburst formation. Therefore, the sunburst sign points to osteosarcoma.

Sunburst periosteal reaction reflects rapid periosteal new bone formation driven by an aggressive, bone-forming tumor. Osteosarcoma is classically associated with this pattern because malignant osteoblasts produce osteoid that lifts the periosteum and lays down radiating spicules of bone, creating the starburst appearance on X-ray. This tumor typically arises in adolescents and young adults, often in the metaphysis of long bones around the knee (distal femur or proximal tibia). By contrast, Ewing sarcoma more often shows onion-skin layering of periosteal reaction, chondrosarcoma tends to have cartilaginous matrix calcifications, and rhabdomyosarcoma is primarily a soft-tissue tumor with less typical sunburst formation. Therefore, the sunburst sign points to osteosarcoma.