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Visualization of the Long Thoracic Nerve using High-Resolution Sonography.

D Lieba-Samal1, J Morgenbesser2, T Moritz2

  • 1Neurology, Medical University of Vienna, Austria.

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|March 21, 2014
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Summary
This summary is machine-generated.

High-resolution ultrasound (HRUS) reliably visualizes the long thoracic nerve (LTN) from its origin to the serratus anterior muscle. This technique is recommended for diagnosing shoulder weakness and scapular winging.

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Area of Science:

  • Anatomy
  • Medical Imaging
  • Neurology

Background:

  • The long thoracic nerve (LTN) is crucial for serratus anterior muscle (SA) function and shoulder stability.
  • Current evaluation methods for LTN pathology are limited.
  • High-resolution ultrasound (HRUS) offers potential for visualizing small peripheral nerves.

Observation:

  • This study aimed to establish the feasibility of visualizing the LTN using HRUS and develop a standardized protocol.
  • The LTN was successfully visualized in all cadaveric specimens and healthy volunteers via HRUS.
  • Dissection confirmed HRUS findings in anatomical specimens.

Findings:

  • HRUS enabled clear visualization of the LTN from its origin to the serratus anterior muscle in the supraclavicular region.
  • The mean diameter of the LTN trunk was 1.6 mm ± 0.3 mm.
  • Consensus was achieved between radiologists in identifying the LTN in all volunteers.

Implications:

  • HRUS provides a reliable method for visualizing the long thoracic nerve.
  • This technique should be integrated into the diagnostic work-up for patients with unexplained shoulder weakness, pain, or scapular winging.
  • Ultrasound offers a non-invasive approach to assess LTN integrity and pathology.