<prompt> Sunray appearance in osteosarcoma is due to:Bone destructionPeriosteal reactionVascular calcificationBone hyperophy  <response>: 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 Ewings sarcoma Sunray appearance osteosarcoma Codmans triangle osteosarcoma. 