A 45 yrs male presented with an expansile lesion in the centre of femoral metaphysis. The lesion shows endosteal scalloping & punctuate calcifications.Most likely diagnosis is -: (A) Osteosarcoma, (B) Chondrosarcoma, (C) Simple bone cyst, (D) Fibrous Dysplasia
Answer is B. You can simply solve this question by knowing very simple fact that punctate calcification is seen in cartilaginous tumors and amongst the given options, only chondrosarcoma is cartilaginous.