Guyon canal syndrome( RID2316 )
A synovial or ganglion cyst is associated with ulnar nerve compression in this patient. Note the denervation change of the abductor digiti minimi. The deep branch of the ulnar nerve is compressed.
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Rate Case :
42 y/o female with mass in wrist and weakness of the 4th and 5th fingers.
Courtesy Phillip Tirman, MD