Ramu, an 8-year old boy presented with pain in the arm. On x-ray, his upper end of humerus demonstrates an expansile lesion in the metaphysis with breach of the overlying cortex. Most likely diagnosis is -: (A) Aneurysmal bone cyst, (B) Unicameral bone cyst, (C) Chondroblastoma, (D) Osteoclastoma
Answer is A. Here the diagnosis is aneurysmal bone cyst because the overlying cortex is breeched, which is not seen in unicameral bone cyst.