Cubital Tunnel Syndrome Due to Synovial Cyst: A Case Report

We report a rare case of ulnar nerve entrapment caused by a synovial cyst derived from the left elbow joint. A 57-year-old male patient with a seven-month history of pain in his left elbow and a progressive and increasing numbness and weakness complaints in his left hand came to our clinic. Weakness and sensory loss of the 4th and 5th fingers were determined in neurological examination. The results of Tinel's sign and Phalen's Test were positive, especially when his left elbow was flexed. In electromyelography, axonal damage and entrapment neuropathy were determined in the left cubital tunnel area. Total excision of the synovial cyst and ulnar nerve anterior subcutaneous transposition were performed in surgical treatment. The patient's pain decreased immediately after the surgery. In this report, we have discussed the pathopysiology of cubital tunnel syndrome due to synovial cyst and which surgical technique may be suitable as our case report.