An 8-year-old child presented with pain at shoulder and arm. A X-ray reveals a uniform well-defined lucent lesion at the metaphysis. Most likely diagnosis is?(AIIMS 2016): (A) Simple bone cyst, (B) Aneurysmal bone cyst, (C) Giant cell tumour, (D) Osteoid osteoma
Answer is A. Ans. A Simple bone cystLucent geographic lesion seen in humeral metaphysis in a child is most commonly a simple bone cyst. Trapdoor signQ/Fallen fragment signQ/Hinged fragment signQ may be seen.