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C-0146 - A long way tunneling through, from elbow to wrist: MR anatomy and pathology of the ulnar nerve involving cubital tunnel and Guyon's canal.

L. Shen, S. Masih, D. Patel, G. R. Matcuk; Los Angeles/US Type: Educational Exhibit
Area of Interests: Musculoskeletal joint, Anatomy, Neuroradiology peripheral nerve
Imaging Technique: MR
Procedure: Contrast agent-intravenous
Special Focus: Edema
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Learning objectives: To understand the definition and clinical presentations of ulnar neuropathy. To learn anatomy with diagram and MR images of the cubital tunnel at the elbow and Guyon's canal at the wrist. To be familiarize with the causes of ulnar neuropathy with case illustrations.

Background: Ulnar neuropathy is a common peripheral neuropathy, and in the recent decade, its incidence has increased, mostly due to the overwhelming increase in duration and frequency of computer use and desk jobs. Ulnar neuropathy is most often due to compression at fibro-osseous tunnels at either of two loca[...]

Findings and procedure details: Normal anatomy of the ulnar Nerve The ulnar nerve is derived from the C8-T1 nerve roots of the lower cervical spine and is a component of the medial cord of the brachial plexus. It lies posteromedial to the brachial artery in the anterior compartment of the upper arm initially then pierces the media[...]

Conclusion: Ulnar neuropathy is a common peripheral neuropathy, usually occurring at the level of the cubital tunnel of the elbow or Guyon’s canal of the wrist. Musculoskeletal radiologists need to understand the anatomy of the cubital tunnel and Guyon’s canal to better interpret MRI performed for ulnar neuropa[...]

Personal information:

References: 1. Andreisek, G, Crook DW, Burg D, Marincek B, Weishaupt D. Peripheral Neuropathies of the Median, Radial, and Ulnar Nerves. Radiographics 2006. 26(5):1267-1287. 2. Stewart, JD. The variable clinical manifestations of ulnar neuropathies at the elbow. J Neurol Neurosurg Psychiatry 1987. 50(3):252-258[...]

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