The cubital tunnel syndrome caused by the two synovial cysts.

The cubital tunnel syndrome caused by several synovial cysts has been rarely reported. In our case, a 63-year-old man had sensorial and motor complaints at the ring and little fingers of the right hand. The claw deformity and the atrophy of the hypothenar and interosseous muscles in the right hand were discovered on physical examination. Froment's sign was positive. Electromyography showed prolonged distal latencies and slowed conduction for ulnar nerve. A small spherical cyst within the cubital tunnel and another spindle-shaped cyst at the distal to the cubital tunnel were found to compress and wrap the ulnar and its branches intra-operatively. Finally, the cysts were removed and the ulnar nerve was decompressed and performed its anterior transposition. Synovial cysts were confirmed by histopathological examination.