Ulnar Nerve Compression in Guyon’s Canal by Ulnar Artery Cystic Adventitial Disease: A Case Report

Cystic adventitial disease is a condition where mucinous cyst(s) develop within the adventitia of blood vessels, especially arteries. The most affected vessel is the popliteal artery while the upper limb vasculature is seldom involved. To our knowledge, there are only 2 articles reporting this disease in the ulnar artery. We present a case of a 52-year-old female patient, a manual worker in a clothing factory, with a month history of increasing pain in her right wrist and gradual weakness that incapacitated her for work activities. She was finally treated surgically and an adventitial cyst of the ulnar artery compressing the ulnar nerve was diagnosed.