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Ulnar nerve pressure
Pressure on the ulnar nerve
* A ganglion may form in the palm of the hand, just distal to the hamate bone. It lies under the hypothenar muscles and causes symptoms when it is large enough to compress the ulnar nerve ; ulnar paraesthesia and weakness then result.
* If the site of the compression lies distal to the sensory branch to the ulnar fingers, weakness without sensory deficit results, affecting the adductor pollicis, the interosseous and the two medial lumbrical muscles.
* Aspiration and surgical removal may be needed.
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