Intraarticular osteoid osteoma of the distal humerus.

Osteoid osteoma is a small, benign, and painful tumor most commonly affecting the extraarticular portions of the long bones, especially the femur or tibia. Osteoid osteoma of the elbow is uncommon. In this article a 19-year-old man with an osteoid osteoma of the distal humerus is presented to illustrate the diagnostic problems and unusual radiographic features of an intraarticular osteoid osteoma.