A 45 yrs male presented with an expansile lesion in the centre of femoral metaphysis. The lesion shows Endosteal scalloping and punctuate calcifications. Most likely diagnosis is:: (A) Osteosarcoma, (B) Chondrosarcoma, (C) Simple bone cyst, (D) Fibrous Dysplasia
Answer is B. Middle aged female with expansile lesion in the femoral metaphysis with endosteal scalloping and punctuate calcifications give the diagnosis of chondrosarcoma. Ref: Concise Pathology By Chandrasoma P, Taylor C, 3rd Edition, Page 971; Robbins Pathologic Basis of Disease, 6th Edition, Page 1241; Essential Ohopedics By Maheshwari, 2nd Edition, Page 223