Osteogenic sarcoma is the eighth most common childhood malignancy, comprising 2.4% of all malignancies in pediatric age group, and approximately 20% of all primary bone malignancies.  It commonly occurs in the long bones of the extremities near metaphyseal growth plates. We present this case of diaphysealosteogenic sarcoma of right radius in a child, because of its unusual presentation and diagnostic problem faced clinically and radiologically. The tumor was diagnosed on the basis of fine needle aspiration cytology (FNAC) and confirmed by histopathology. Long term follow up of Limb salvage surgery and neo adjuvant chemotherapy showed excellent results in this patient with unusual presentation.