INTRODUCTION :
The guyon’s canal syndrome is a relatively rare entity . this disorder is due to the ulnar nerve compression when it passes through this canal at The wrist which is an uncommon site for the ulnar nerve compression .
Clinical examination is crucial for guyon’s canal syndrome diagnosis , however it can be misleading due to the variations of clinical presentations especially when the sensory symptoms are absent or atypical.
Moreover Vascular lesions are not the ususal cause of the compression of the ulnar nerve at the guyon’s canal but should be kept in mind as a possible etiology particulary when no obvious cause was identified.
The authors experienced a rare case of guyon’s canal syndrome caused by an aneuvrysm of the ulnar artery in a 20 years old male.