Osteoid Osteoma of the Talus Presenting as Posterior Ankle Impingement: Case Reports

摘要

Osteoid osteoma is a common bone tumor that comprises 10% to 12% of benign bone tumors. The tumor consists of a central vascularized nidus, up to 10 mm in size, surrounded by a zone of uniform bone sclerosis. Classification is based on its location in the bone, which includes cortical, medullary, or subperiosteal. Cortical tumors make up 80% of all osteoid osteomas. The tumor occurs predominantly in children and young adults and is more common in males, with a male-to-female ratio of 1.6:1 to 4:1. Approximately half of osteoid osteomas occur in the femur and tibia while tumors in the foot are unusual and account for about 4% of cases.14 The talus is the most common bone affected in the foot, and the tumor is usually located in the talar neck. Osteoid osteoma usually presents with night pain classically relieved by salicylates. The diagnosis of osteoid osteoma in the foot can be challenging because of unusual location and atypical symptoms, which may mimic more common conditions affecting the foot or ankle.