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The cubital tunnel syndrome is a compressive neuropathy of the ulnar nerve around the elbow. It is the most common neurocompression syndrome in the upper limb after carpal tunnel syndrome. Ulnar nerve entrapment is usually located under the thickening of the proximal fascia between two heads of the ulnar flexor of the carpus, or in the arcade of Osborne at the distal part of the epicondylar curve. However, it can also be caused by occupying masses along the course of the nerve.
This report shows a case of cubital tunnel syndrome caused by ulnar entrapment by a medial synovial cyst. Epidemiology, pathogenesis and diagnosis were discussed and literature was reviewed.
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