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MR neurogram

Bhavuk Garg, Vikrant Manhas, Anand Vardhan, Deep Narayan Srivastava, Chandan J Das, Deepti Vibha, Vivek Gupta, Rajesh Malhotra, Prakash Kotwal
PURPOSE: To objectively assess recovery of thumb opposition in patients with carpal tunnel syndrome (CTS) after open carpal tunnel release and to evaluate electrophysiological and magnetic resonance (MR) neurography findings as predictors of thumb opposition recovery. METHODS: A total of 22 patients with severe CTS and thenar atrophy were included in this study. A detailed clinical, electrophysiological, and MR neurography evaluation was done both before and after surgery at 6 months to assess thumb opposition recovery...
June 19, 2018: Journal of Hand Surgery
Stephen T Magill, Marcel Brus-Ramer, Philip R Weinstein, Cynthia T Chin, Line Jacques
Neurogenic thoracic outlet syndrome (nTOS) is caused by compression of the brachial plexus as it traverses from the thoracic outlet to the axilla. Diagnosing nTOS can be difficult because of overlap with other complex pain and entrapment syndromes. An nTOS diagnosis is made based on patient history, physical exam, electrodiagnostic studies, and, more recently, interpretation of MR neurograms with tractography. Advances in high-resolution MRI and tractography can confirm an nTOS diagnosis and identify the location of nerve compression, allowing tailored surgical decompression...
September 2015: Neurosurgical Focus
John C Quinn, Kristen Fruauff, Darren R Lebl, Ashley Giambrone, Frank P Cammisa, Ajay Gupta, J Levi Chazen
STUDY DESIGN: Observational study. OBJECTIVE: To demonstrate use of magnetic resonance (MR) neurography to visualize the course of the lumbar plexus at the L4-L5 disc space. SUMMARY OF BACKGROUND DATA: Risk of injury to the lumbar plexus during lateral transpsoas approach for lumbar interbody fusion (LLIF) is significant. We describe a new technique for preoperative mapping using magnetic resonance neurography to directly visualize the course of the plexus relative to the L4-L5 disc space...
June 15, 2015: Spine
Nayela N Keen, Cynthia T Chin, John W Engstrom, David Saloner, Lynne S Steinbach
INTRODUCTION: Early diagnosis of ulnar neuropathy at the elbow is important. Magnetic resonance neurography (MRN) images peripheral nerves. We evaluated the usefulness of elbow MRN in diagnosing ulnar neuropathy at the elbow. METHODS: The MR neurograms of 21 patients with ulnar neuropathy were reviewed retrospectively. MRN was performed prospectively on 10 normal volunteers. The MR neurograms included axial T1 and axial T2 fat-saturated and/or axial STIR sequences...
April 2012: Skeletal Radiology
Rose Du, Kurtis I Auguste, Cynthia T Chin, John W Engstrom, Philip R Weinstein
OBJECT: Treatment of spinal and peripheral nerve lesions relies on localization of the pathology by the use of neurological examination, spinal MR imaging and electromyography (EMG)/nerve conduction studies (NCSs). Magnetic resonance neurography (MRN) is a novel imaging technique recently developed for direct imaging of spinal and peripheral nerves. In this study, the authors analyzed the role of MRN in the evaluation of spinal and peripheral nerve lesions. METHODS: Imaging studies, medical records, and EMG/NCS results were analyzed retrospectively in a consecutive series of 191 patients who underwent MRN for spinal and peripheral nerve disorders at the University of California, San Francisco between March 1999 and February 2005...
February 2010: Journal of Neurosurgery
F A Howe, A G Filler, B A Bell, J R Griffiths
We have made cross-sectional image "neurograms" in which peripheral nerve has a greater signal intensity than that of other tissue. Neurographic images of the rabbit forelimb were obtained using a spin-echo magnetic resonance imaging (MRI) technique that combines fat suppression and diffusion weighting. After fat suppression the nerve shows up in relative isolation and is brighter than the surrounding tissue due to its longer T2 relaxation time of approximately 50 ms compared to approximately 27 ms for muscle...
December 1992: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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