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On the painful side, the accessory abductor digiti minimi muscle was observed. The muscle traveled through the Guyon’s canal and approximated distally to the abductor digiti minimi muscle. The palmar cutaneous branch of the ulnar nerve was seen arising from the radial side of its main trunk and radial to the ulnar artery and veins. The nerve was squeezed inside the Guyon’s canal by the accessory abductor digiti minimi muscle, rendering the nerve fascicle more flattened than that of the contralateral side.