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European Radiology
Published in: European Radiology 6/2019

01-06-2019 | Magnetic Resonance Imaging | Musculoskeletal

Diffusion tensor imaging of the sciatic nerve in Charcot–Marie–Tooth disease type I patients: a prospective case–control study

Authors: Hyun Su Kim, Young Cheol Yoon, Byung-Ok Choi, Wook Jin, Jang Gyu Cha, Jae-Hun Kim

Published in: European Radiology | Issue 6/2019

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Abstract

Objectives

This study aimed to evaluate whether diffusion tensor imaging (DTI) parameters and cross-sectional area (CSA) can differentiate between the sciatic nerve of Charcot–Marie–Tooth (CMT) disease type I (demyelinating form) patients and that of controls.

Methods

This prospective comparison study included 18 CMT type I patients and 18 age/sex-matched volunteers. Magnetic resonance imaging including DTI and axial T2-weighted Dixon sequence was performed for each subject. Region of interest analysis was independently performed by two radiologists on each side of the sciatic nerve at four levels: hamstring tendon origin (level 1), lesser trochanter of the femur (level 2), gluteus maximus tendon insertion (level 3), and mid-femur (level 4). Fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD), and radial diffusivity (RD) were calculated. The CSA of the sciatic nerve bundle was measured using axial water-only image at each level. Comparisons of DTI parameters between the two groups were performed using the two-sample t test and Mann–Whitney U test. Interobserver agreement analysis was also conducted.

Results

Interobserver agreement was excellent for all DTI parameter analyses. FA was significantly lower at all four levels in CMT patients than controls. RD, MD, and CSA were significantly higher at all four levels in CMT patients. AD was significantly higher at level 2 in CMT patients.

Conclusion

DTI assessment of the sciatic nerve is reproducible and can discriminate the demyelinating nerve pathology of CMT type I patients from normal nerves. The CSA of the sciatic nerve is also a potential parameter for diagnosing nerve abnormality in CMT type I patients.

Key Points

• Diffusion tensor imaging parameters of the sciatic nerve at proximal to mid-femur level revealed significant differences between the Charcot–Marie–Tooth disease patients and controls.
• The cross-sectional area of the sciatic nerve was significantly larger in the Charcot–Marie–Tooth disease patients.
• Interobserver agreement was excellent (intraclass coefficient > 0.8) for all diffusion tensor imaging parameter analyses.
Appendix
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Metadata
Title
Diffusion tensor imaging of the sciatic nerve in Charcot–Marie–Tooth disease type I patients: a prospective case–control study
Authors
Hyun Su Kim
Young Cheol Yoon
Byung-Ok Choi
Wook Jin
Jang Gyu Cha
Jae-Hun Kim
Publication date
01-06-2019
Publisher
Springer Berlin Heidelberg
Published in
European Radiology / Issue 6/2019
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-018-5958-1

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