7 years old child presents with a lesion in upper tibia. X ray shows radioluscent area with Codmans triangle and Sunray appearance. Diagnosis is: (A) Ewing sarcoma, (B) Osteosarcoma, (C) Osteoid Osteoma, (D) Chondrosarcoma
Answer is B. Sunray (sunburst) appearance and Codmans triangle ***typical freatures of Osteosarcoma ***may also be seen in Ewings sarcoma, osteomyelitis onion peel apperacne ***typical feature of Ewings sarcoma ***May also be seen in Osteosarcoma, and osteomyelitis Refer Maheshwari 9th/e p 240.