European Radiology

, Volume 24, Issue 3, pp 756–761

Thoracic outlet syndrome in 3T MR neurography—fibrous bands causing discernible lesions of the lower brachial plexus

  • P. Baumer
  • H. Kele
  • T. Kretschmer
  • R. Koenig
  • M. Pedro
  • M. Bendszus
  • M. Pham
Neuro

DOI: 10.1007/s00330-013-3060-2

Cite this article as:
Baumer, P., Kele, H., Kretschmer, T. et al. Eur Radiol (2014) 24: 756. doi:10.1007/s00330-013-3060-2

Abstract

Objectives

To investigate whether targeted magnetic resonance neurography (MRN) of the brachial plexus can visualise fibrous bands compressing the brachial plexus and directly detect injury in plexus nerve fascicles.

Methods

High-resolution MRN was employed in 30 patients with clinical suspicion of either true neurogenic thoracic outlet syndrome (TOS) or non-specific TOS. The protocol for the brachial plexus included a SPACE (3D turbo spin echo with variable flip angle) STIR (short tau inversion recovery), a sagittal-oblique T2-weighted (T2W) SPAIR (spectral adiabatic inversion recovery) and a 3D PDW (proton density weighted) SPACE. Images were evaluated for anatomical anomalies compressing the brachial plexus and for abnormal T2W signal within plexus elements. Patients with abnormal MR imaging findings underwent surgical exploration.

Results

Seven out of 30 patients were identified with unambiguous morphological correlates of TOS. These were verified by surgical exploration. Correlates included fibrous bands (n = 5) and pseudarthrosis or synostosis of ribs (n = 2). Increased T2W signal was detected within compressed plexus portion (C8 spinal nerve, inferior trunk, or medial cord) and confirmed the diagnosis.

Conclusions

The clinical suspicion of TOS can be diagnostically confirmed by MRN. Entrapment of plexus structures by subtle anatomical anomalies such as fibrous bands can be visualised and relevant compression can be confirmed by increased T2W signal of compromised plexus elements.

Key Points

MR neurography (MRN) can aid the diagnosis of thoracic outlet syndrome (TOS).

Identifiable causes of TOS in MRN include fibrous bands and bony anomalies.

Increased T2W signal within brachial plexus elements indicate relevant nerve compression.

High positive predictive value allows confident and targeted indication for surgery.

Keywords

TOS Thoracic outlet syndrome MRI MR neurography Fibrous band 

Abbreviations

TOS

Thoracic outlet syndrome

MRN

Magnetic resonance neurography

ENG

Electroneurography

EMG

Electromyography

PDW

Proton density weighted

SPACE

3D turbo spin echo with variable flip angle

STIR

Short tau inversion recovery

SPAIR

Spectral adiabatic inversion recovery

Copyright information

© European Society of Radiology 2013

Authors and Affiliations

  • P. Baumer
    • 1
  • H. Kele
    • 2
  • T. Kretschmer
    • 3
  • R. Koenig
    • 4
  • M. Pedro
    • 4
  • M. Bendszus
    • 1
  • M. Pham
    • 1
  1. 1.Department of NeuroradiologyHeidelberg University HospitalHeidelbergGermany
  2. 2.Centre for Neurology and Clinical NeurophysiologyNeuer WallHamburgGermany
  3. 3.Department of NeurosurgeryOldenburg Evangelical Hospital, Oldenburg UniversityOldenburgGermany
  4. 4.Department of NeurosurgeryUlm University Hospital/Bezirkskrankenhaus GuenzburgGünzburgGermany

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