Ulnar nerve compression

An 18 year old top tennis player developed pain and weakness of the hand.

Unfortunately the Gayon’s Canal is not well annotated but anterior to the ulnar nerve is a large abnormal muscle.

To the left and inferior to the muscle is the pisiform.

Medial and posterior to the large muscle is the ulnar artery and veins.

There is also slight thickening of the ulnar nerve underneath the abnormal muscle.

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