Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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An Updated Review of Magnetic Resonance Neurography for Plexus Imaging

  • Joon-Yong Jung (Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea) ;
  • Yenpo Lin (Department of Radiology and Imaging, Hospital for Special Surgery, Weill Cornell Medicine) ;
  • John A Carrino (Department of Radiology and Imaging, Hospital for Special Surgery, Weill Cornell Medicine)
  • Received : 2023.02.15
  • Accepted : 2023.08.06
  • Published : 2023.11.01
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Abstract

Magnetic resonance neurography (MRN) is increasingly used to visualize peripheral nerves in vivo. However, the implementation and interpretation of MRN in the brachial and lumbosacral plexi are challenging because of the anatomical complexity and technical limitations. The purpose of this article was to review the clinical context of MRN, describe advanced magnetic resonance (MR) techniques for plexus imaging, and list the general categories of utility of MRN with pertinent imaging examples. The selection and optimization of MR sequences are centered on the homogeneous suppression of fat and blood vessels while enhancing the visibility of the plexus and its branches. Standard 2D fast spin-echo sequences are essential to assess morphology and signal intensity of nerves. Moreover, nerve-selective 3D isotropic images allow improved visualization of nerves and multiplanar reconstruction along their course. Diffusion-weighted and diffusion-tensor images offer microscopic and functional insights into peripheral nerves. The interpretation of MRN in the brachial and lumbosacral plexi should be based on a thorough understanding of their anatomy and pathophysiology. Anatomical landmarks assist in identifying brachial and lumbosacral plexus components of interest. Thus, understanding the varying patterns of nerve abnormalities facilitates the interpretation of aberrant findings.

Keywords

References

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