Osteoid osteoma of the pisiform bone: A rare cause of wrist pain.

Non-traumatic wrist pain remains a diagnostic challenge. An accurate diagnosis is crucial in order to choose the appropriate treatment. We report the case of a 23-year-old female with a four-month history of mainly nocturnal wrist pain. There was no history of trauma or prior surgery. Radiographs and CT scans showed a lytic lesion with central nidus and sclerotic margins in the pisiform bone. Bone scan showed increased uptake in the pisiform bone. The diagnosis of osteoid osteoma was confirmed by histopathological analysis after complete surgical resection. Osteoid osteoma of the carpal bones is a rare cause of wrist pain and can raise diagnostic issues. Diagnosis is based on both clinical and radiological features; histopathological analysis can confirm the diagnosis. Treatment depends on several criteria and multiple options are possible, but surgical excision is often preferred for the wrist. Osteoid osteoma should always be considered in young patients presenting with chronic unexplained wrist pain.