A 32-year-old woman presented with left wrist pain and tender mass at the wrist for 1 month. She described left 4th and 5th digit tingling which worsened with palpation of the mass. Sensory nerve action potential of the digital sensory branch of the left ulnar nerve was of low amplitude and prolonged distal latency. Motor conduction studies and needle EMG were normal. Wrist MRI (figure) showed a ganglion cyst compressing the ulnar nerve which was surgically removed with partial improvement in the patient's symptoms. Ganglion cysts at the wrist are frequent and benign but can occasionally compromise the median or ulnar nerve as shown in this case.1
(A) Ganglion cyst at the wrist. (B, C) (Coronal and axial views) STIR MRI of the wrist with contrast shows a ganglion cyst (arrow) compressing an enhancing ulnar nerve (arrowhead). (D) T1 MRI of the wrist (axial view) shows the cyst in relation to the anatomic structures.
Author contributions
Chafic Karam: drafting/revising the manuscript, study concept or design, analysis or interpretation of data. Colin C. Quinn, MD: study concept or design, analysis or interpretation of data. Sabrina Paganoni, MD, PhD: study concept or design, analysis or interpretation of data. William S. David, MD, PhD: study concept or design, analysis or interpretation of data.
Footnotes
C. Karam serves on the editorial board of the Neurology® Resident & Fellow Section. C. Quinn, S. Paganoni, and W. David report no disclosures. Go to Neurology.org for full disclosures.
- Copyright © 2012 by AAN Enterprises, Inc.
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