Ulnar Neuropathy Caused by a Schwannoma in the Guyon ’ s Cannal

nerve entrapment at the wrist or hand that can cause motor, sensory or combined motor and sensory loss depending on the localization of entrapment along the canal. The most common etiological factor is the compression of the ulnar nerve at the wrist by a ganglion. However, other conditions such as anomalous musculotendinous arches, lipomas, diseases of the ulnar artery, fractures of the hamate, direct trauma to the ulnar side of the hand. Schwannoma, also known as neurilemmoma of the hand is rare. We report a rare case of ulnar neuropathy caused by a schwannoma at the level of Guyon’s canal.