A Rare Case of Carpal Tunnel Syndrome with Bifid Median Nerve and Palmaris Profundus Muscle.

Carpal tunnel syndrome (CTS) is the most common entrapment neuropathy. We report an extremely rare case of CTS associated with a bifid median nerve and palmaris profundus muscle. A 68-year-old man presented with numbness and pain in the right hand. Intraoperatively, a bifid median nerve was identified, with the ulnar branch severely compressed by the palmaris profundus muscle. The muscle was resected, leading to symptom resolution. Anatomical variations of the median nerve and anomalous muscles should be considered in CTS. Preoperative imaging and open carpal tunnel release are recommended to identify and address such variations.