Osteoid osteoma is the third most common benign neoplasm of bone, occurring predominantly in adolescents and young adult's male patients with an approximate male/female ratio of 2 to 1. It is a small, dis¬tinctive, non-progressive, be¬nign osteoblastic lesion that is usually accompanied by severe pain. In 1935 Jaffe was the first to report the iden¬tification of this osteoblastic lesion . Osteoid osteoma may occur in any bone, but predominantly occur in the appendicular skeleton. According to Musculoskeletal Tumor Society Staging System for benign tumors, osteoid osteoma is a stage-2 lesion. It is classified as cortical, cancellous, or subperiosteal. Cortical lesions are the most common. In over 50% of cases, the lesions are centered on the cortex of femoral and tibial diaphysis.