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Chirurgia 2011 October;24(5):287-90

language: Italian

Anatomic anomalies of Guyon’s canal: case report and literature review

Monacelli G., Lotito S., Testa I., Mazzone R., Falchetti A., Irace S.

UP Chirurgia Plastico Ricostruttiva d’Urgenza, DEA – Azienda Policlinico Umberto I, Università degli Studi di Roma “La Sapienza”, Roma, Italia


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Guyon’s canal is a fibrosseous tunnel, approximately 4-cm long, located in the ulnar side of the wrist: it begins at the proximal extent of transverse carpal ligament and ends at the aponeurotic arch of hypothenar muscles. Its importance in the field of Hand Surgery is justified by the fact that it is passed through by the ulnar nerve, together with ulnar artery and veins. Being the canal a closed anatomic compartment, every internal variation of volume can determine compression of the structures that lay inside it. A compression of the ulnar nerve in his course through Guyon’s canal is responsible of an entrapment syndrome called Guyon’s Canal Syndrome. This syndrome can be caused by neoformations, such as lypomas and cysts, occupational microtrauma or anatomic anomalies, among which muscular anomalies are the most important. The presence of an anomalous muscle, most frequently an accessory abductor digiti minimi, inside the Guyon’s canal is rather frequent and often asymptomatic, yet sometimes it can bring entrapment symptoms, such as disesthesia and paresthesia of IV and V finger, loss of strength and hypotrophy of hypothenar muscles and dorsal interosseous muscles. The finding of an anomalous accessory muscle inside the Guyon’s canal led us to make a review of literature.

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