Sunray appearance in osteosarcoma is due to:: (A) Bone destruction, (B) Periosteal reaction, (C) Vascular calcification, (D) Bone hyperophy
Answer is B. Periosteal reactions are classified as non-aggressive and aggressive. Non- aggressive solid periosteal reaction is usually seen in osteomyelitis. Aggressive periosteal reaction includes : Onion peel appearance (Ewing's sarcoma) Sunray appearance (osteosarcoma) Codman's triangle (osteosarcoma).