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Imaging of hemifacial spasm.

M Hermier1

  • 1Department of Diagnostic and Functional Neuroradiology, hôpital neurologique & neurochirurgical P.-Wertheimer, 59, boulevard Pinel, 69677 Bron, France; Hospices civils de Lyon, 63003 Lyon, France.

Neuro-Chirurgie
|April 30, 2018
PubMed
Summary

Primary hemifacial spasms often involve neurovascular conflicts near the brainstem. Advanced MRI techniques are crucial for identifying these vascular compressions and guiding treatment for this condition.

Keywords:
Facial nerveHemifacial spasmImagingMRINeurovascular conflictVascular compression syndrome

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Area of Science:

  • Neurology
  • Neurosurgery
  • Radiology

Background:

  • Primary hemifacial spasm (HFS) is frequently linked to neurovascular conflicts.
  • These conflicts typically occur at the facial nerve's root exit zone near the brainstem.

Purpose of the Study:

  • To detail the role of imaging in diagnosing HFS.
  • To identify and characterize neurovascular conflicts causing HFS.
  • To exclude secondary causes of HFS.

Main Methods:

  • Utilizing high-resolution anatomical hyper T2-weighted sequences on MRI.
  • Employing magnetic resonance angiography (MRA) with 1.5 or 3 Tesla magnets.
  • Systematically searching for and characterizing neurovascular conflicts.

Main Results:

  • Neurovascular conflicts are present in almost all primary HFS cases.
  • Anterior-inferior cerebellar artery (AICA), posterior-inferior cerebellar artery (PICA), and vertebrobasilar artery (VBA) are common culprits.
  • Multiple conflicts, bilateral compressions by the same vessel, and contributing anatomical factors (e.g., dolichoectasia, small posterior fossa, bony malformations) are observed.

Conclusions:

  • Imaging is essential for diagnosing primary HFS by identifying neurovascular conflicts.
  • Advanced MRI and MRA are key diagnostic tools.
  • Understanding the nature and location of vascular compression is vital for patient management.