Osteoid osteoma: a pictorial review.

Osteoid osteoma is a small, benign osteoblastic bone tumor most commonly found in long bones, such as the femur or tibia. Osteoid osteomas account for roughly 10% of all benign bone tumors and characteristically present with dull aching pain, worse at night, and often relieved with NSAIDS. They typically present in young individuals, most commonly between the ages of seven and 25 years and in a male to female ratio of 3:1. An understanding of its classic radiographic appearance is necessary for diagnosis.