Osteoid osteoma of the pisiform: A case report

Hypertrophic Pisiform: A Case of Osteoid Osteoma

“…1 Osteoid osteoma in the pisiform bone is especially rare, and to the best of our knowledge, only five cases have been reported before. [2][3][4][5] One of the unique findings in this case was the hypertrophic change of the pisiform. Osteoid osteoma can cause hypertrophy of the pisiform.…”

“…Osteoid osteoma is characterized by an osteoid-forming lesion called a nidus, reported to be less than 1.5 cm in diameter. 2 It accounts for 3% of all excised primary bone tumors, and 10% of benign bone tumors. 2,6 The patients tend to have pain, usually worse at night responding well to treatment with NSAIDs.…”

“…2 It accounts for 3% of all excised primary bone tumors, and 10% of benign bone tumors. 2,6 The patients tend to have pain, usually worse at night responding well to treatment with NSAIDs. The most common sites are the tibia and femur, and only 2% of osteoid osteoma lesions involve the carpal bones.…”

“…The most common sites are the tibia and femur, and only 2% of osteoid osteoma lesions involve the carpal bones. 2 The most frequently involved carpal bones are the scaphoid and the capitate, which may reflect a relationship between the size of the affected bones and the pathogenesis or ease with which to find the tumor. 2,4 Osteoid osteoma of the pisiform is extremely rare.…”

“…Many reports have revealed a tendency for a delay in the diagnosis of osteoid osteoma of the carpal bones. [1][2][3][4][5][6] One of the reasons is that patients often present with a history of wrist injury, or other suggestive diseases such as arthritis, carpal tunnel syndrome, ganglion, infection, or neuroma. Inflammatory reaction around the nidus often causes actual wrist arthritis or synovitis.…”