Osteoid osteoma of the os calcis in a teenage athlete.

Osteoid osteomas are small, benign bone tumors most commonly located in the proximal femur or tibia. The classic presentation is localized pain increasing in severity at night, and relieved by the use of anti-inflammatory medications. In a young athlete complaining of foot pain, many conditions should be included in the differential diagnosis. A case of osteoid osteoma of the os calcis in a teenage basketball player is presented.