Fig. 2

Intraoperative findings. a The subcutaneous lipoma was found on the flexor retinaculum and was resected. b Open carpal tunnel release and resection of the spiky bony protrusion (asterisk) on the hook of hamate were performed after retracting the ulnar artery (arrow) and the ulnar nerve (arrowhead). c The flexor digitorum profundus tendons of the ring and little fingers (hash mark) displayed synovitis and partial laceration in the carpal tunnel