Two cases of ulnar nerve compression in the Guyon canal due to a false aneurysm.

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Ulnar nerve palsy due to an aneurysm in the Guyon canal is rarely described. Two cases of ulnar nerve compression caused by false aneurysm of the ulnar artery following trauma were treated in our clinic. Although the cases revealed a typical symptom and sign of entrapment neuropathy, there was an aneurysm without our suspicion at the first examination in a case.In preoperative examination including careful palpation of pulsating tumor, Allen's test, Doppler scanning and angiography, the aneurysm in the Guyon canal was diagnosed.The operative finding of both cases demonstrated a compression at bifurcation of the ulnar nerve due to false aneurysm from the ulnar artery within the canal.After removal of the aneurysm, their clinical symptoms were almost completely recovered.In diagnosing such cases, especially, a careful palpation of pulsating tumor and Allen's test are important.
西日本整形・災害外科学会の論文