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INCLUDE WHEN CITING Published online September 14, 2018; DOI: 10.3171/2018.5.JNS172840.
Disclosures The authors report no conflict of interest.
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Intraoperative photograph (A) and illustration (B) of an abnormal recurrent branch of the medial ulnar nerve (a) penetrating the FCU tendon (b) before joining the main trunk (c) and entering Guyon’s canal along with the ulnar artery (d), at the distal forearm level. The FCU tendon was involved proximally to its insertion into the pisiform bone (e). Intraoperative photograph (C) and illustration (D) of the ulnar nerve loop (a) after its release from the FCU tendon (b).
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