Osteoid osteoma is a benign primary bone lesion that presents more commonly in the long bones of the lower extremity. Lesions in hand may represent differently, mimicking tenosynovitis or other common wrist problems. A 26-year-old right-handed man with six months history of progressive pain and swelling in the dorsal ulnar aspect of the left wrist was unresponsive to conservative treatment. Radiographs were considered as normal and computed tomography (CT) scan revealed 5 mm lytic lesion in the dorsal aspect of hamate. The patient underwent surgery and was diagnosed as osteoid osteoma. Osteoid osteoma in the carpal bones is rare and manifests itself like tenosynovitis. CT scan should be a study of choice in cases where there are normal radiographs but a high level of clinical suspicion.
Key words: Hamate, carpal bones, osteoid osteoma, benign bone tumor, carpal neoplasm
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