Suprascapular Nerve Entrapment at the Spinoglenoid Notch By A Ganglion Cyst

Abstract

Suprascapular nerve entrapment at the spinoglenoid notch by a ganglion cyst results in the paralysis of the terminal motor branch of the nerve, with isolated atrophy of the infraspinatus muscle, loss of strength in external rotation, and posterior shoulder pain. Increased awareness of this nerve compression is paramount in order to avoid the stage of irreversible infraspinatus muscle wasting and long term disability. Magnetic resonance imaging scan, electromyography and nerve conduction velocity studies can confirm the diagnosis and lead to an early arthroscopic nerve decompression and favorable functional results. We present a rare case of spinoglenoid ganglion cyst compression of the distal suprascapular nerve and discuss the recent developments in anatomy, aetiology, diagnosis, and review the treatment and current trends in the management of this condition.