Osteoid osteoma of the hallux.

A case involving a 29-year-old female with aspirin allergy who exhibited osteoid osteoma at the distal phalanx of the hallux is presented. Osteoid osteoma is a relatively rare occurrence in the foot (1). It is a benign bone tumor usually consisting of an oval osteolytic area with a central nidus (2). Pathologic, clinical, and radiographic findings are included.