指輪指遠位指骨の骨様骨腫：稀な症例報告

Osteoid osteoma (OO) is a benign osteoblastic lesion and a relatively common bone tumor; however, its diagnosis can be challenging depending on the site of occurrence. We present a rare case of OO located in the distal phalanx of the right ring finger in a 23-year-old male. The patient experienced pain and swelling beginning two months after sustaining a finger contusion. Radiographic evaluation, including X-rays and CT, revealed a radiolucent lesion with central calcification characteristic of OO. Surgical excision was performed, preserving the nail bed, and histopathological analysis confirmed the diagnosis. At the two-month follow-up, there was no evidence of recurrence. This case underscores the importance of including OO in the differential diagnosis of fingertip bone lesions. Complete surgical resection can lead to excellent clinical outcomes without functional compromise.