Posterior Interosseous Nerve Palsy Caused by Ganglion at the Edge of Supinator Muscle in Shoeshine Man -A Case Report-

Case Report

J Korean Assoc EMG Electrodiagn Med 2016;18(1):18-21.
Published online June 30, 2016.

Received: 12 January 2016 • Revised: 8 June 2016 • Accepted: 8 June 2016

Abstract

Posterior interosseous nerve (PIN) is a deep muscular branch of radial nerve, and non-traumatic paralysis of this nerve is relatively rare. This case reports that shoeshine man had complained of finger extensor muscles weakness caused by PIN nerve compression because of ganglion at the edge of supinator muscles. In magnetic resonance imaging, there was 1.3 × 0.6 × 1.6 cm-sized ganglion occurring at the edge of supinator muscles and compression of PIN nerve. This ganglion may also be associated with his occupational factor. After resection of ganglion, his finger extensor weakness was improved, but still remained.

Key Words: posterior interosseous nerve, ganglion, supinator