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Trigeminal neuralgia: pathology and pathogenesis.

S Love1, H B Coakham

  • 1Department of Neuropathology, Institute of Clinical Neurosciences, Frenchay Hospital, Bristol BS16 1LE, UK. seth.love@bris.ac.uk

Brain : a Journal of Neurology
|November 10, 2001
PubMed
Summary

Trigeminal neuralgia is typically caused by demyelination of trigeminal nerve fibers due to compression. Surgical decompression offers rapid symptom relief by reducing abnormal nerve impulse conduction.

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Area of Science:

  • Neuroscience
  • Neurology
  • Pathophysiology

Background:

  • Trigeminal neuralgia (TN) is strongly linked to demyelination of trigeminal sensory fibers.
  • Compression of the trigeminal nerve root by blood vessels is a primary cause, leading to focal demyelination.
  • Multiple sclerosis and posterior fossa masses can also cause TN through demyelination.

Purpose of the Study:

  • To elucidate the mechanisms underlying trigeminal neuralgia.
  • To investigate the role of demyelination and nerve fiber interaction in TN pathogenesis.
  • To evaluate the efficacy of surgical decompression for TN.

Main Methods:

  • Examination of trigeminal nerve roots from TN patients.
  • Analysis of nerve root demyelination and axonal apposition.
  • Review of experimental studies on nerve impulse generation and conduction.
  • Assessment of outcomes following surgical decompression.

Main Results:

  • Focal demyelination and close apposition of axons were observed in compressed nerve roots.
  • This anatomical arrangement facilitates ectopic impulse generation and ephaptic conduction.
  • Surgical decompression rapidly relieved symptoms in most patients with vascular TN.
  • Nerve conduction improved post-decompression, suggesting reversal of conduction block.

Conclusions:

  • Demyelination and ephaptic spread are key mechanisms in trigeminal neuralgia.
  • Vascular compression is a significant cause, and decompression is an effective treatment.
  • Remyelination may play a role in sustained symptom relief and spontaneous remission.

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