• Ty K Subhawong, Kenneth C Wang, Shrey K Thawait, Eric H Williams, Shahreyar Shar Hashemi, Antonio J Machado, John A Carrino, and Avneesh Chhabra.
• The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins Hospital, 601 N. Caroline Street, Room 4214, Baltimore, MD 21287, USA. tsubhaw1@jhmi.edu
• Skeletal Radiol. 2012 Jan 1;41(1):15-31.

AbstractPeripheral nerves often traverse confined fibro-osseous and fibro-muscular tunnels in the extremities, where they are particularly vulnerable to entrapment and compressive neuropathy. This gives rise to various tunnel syndromes, characterized by distinct patterns of muscular weakness and sensory deficits. This article focuses on several upper and lower extremity tunnels, in which direct visualization of the normal and abnormal nerve in question is possible with high resolution 3T MR neurography (MRN). MRN can also serve as a useful adjunct to clinical and electrophysiologic exams by discriminating adhesive lesions (perineural scar) from compressive lesions (such as tumor, ganglion, hypertrophic callous, or anomalous muscles) responsible for symptoms, thereby guiding appropriate treatment.

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