Which MRI findings are characteristic of ulnar neuropathy?

Updated: Jun 08, 2018
  • Author: Charles F Guardia, III, MD; Chief Editor: Nicholas Lorenzo, MD, MHA, CPE  more...
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On MRI, normal nerves appear as smooth, round, or ovoid structures that are isointense to surrounding muscles on T1-weighted sequences. There is often a rim of hyperintense signal on T1. On T2-weighted images, the nerve is normally isointense to slightly hyperintense with respect to surrounding muscle. Normal nerves do not enhance after administration of gadolinium.

Possible changes that could be seen in neuropathies include increased signal intensity within the nerve on T2-weighted sequences. On MRI, increased signal intensity is a better indicator of ulnar nerve entrapment than enlargement of the nerve is.

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