Acta Neurochirurgica

, Volume 154, Issue 9, pp 1627–1633 | Cite as

Patients with idiopathic trigeminal neuralgia have a sharper-than-normal trigeminal-pontine angle and trigeminal nerve atrophy

  • Seung Man Ha
  • Sang Heum Kim
  • Eun Hye Yoo
  • In-bo Han
  • Dong-A Shin
  • Kyung Gi Cho
  • Sang Sup Chung
  • Young Seok Park
Clinical Article

Abstract

Background

Trigeminal neuralgia (TN) is primarily diagnosed by symptoms and patient history. Magnetic resonance (MR) imaging can be helpful in visualizing the neurovascular compression of the trigeminal nerve in TN patients, but the current parameters used as diagnostic markers for TN are less than optimal. The aim of this study is to assess whether the angle between the trigeminal nerve and the pons (the trigeminal-pontine angle) on the affected side of patients with idiopathic TN differs from that of the unaffected side and that found in controls without TN.

Methods

A case-control study of 30 clinically diagnosed idiopathic TN patients aged 30 to 79 years and 30 age- and sex-matched controls was conducted. We compared the trigeminal-pontine angle and trigeminal nerve atrophy via fast-imaging employing steady-state acquisition (FIESTA) MR imaging.

Results

A sharp trigeminal-pontine angle was observed in 25 patients (25/30) on the affected side. As such, the mean angle of the trigeminal nerve on the affected side (40.17) was significantly smaller than that on the unaffected side (48.91, p = 0.001) and that in the control group (52.02, p < 0.001).

Conclusions

A sharp trigeminal-pontine angle on the affected side was found in idiopathic TN patients by FIESTA imaging. This suggests that a sharp trigeminal-pontine angle increases the chance of neurovascular compression on the medial side of the trigeminal nerve.

Keywords

Trigeminal neuralgia Magnetic resonance imaging Atrophy Trigeminal nerve 

Notes

Acknowledgments

The authors would like to thank Hye Young Yu (R.N.), Ju-Mi Kim (R.N.), and Hyouk Sang Kwon (BS) for data acquisition.

Disclosure of Funding

None.

Financial Support and Industry Affiliations

None.

Conflict of Interest

None.

Supplementary material

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ESM 1

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High resolution image (TIFF 437 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Seung Man Ha
    • 1
  • Sang Heum Kim
    • 2
  • Eun Hye Yoo
    • 2
  • In-bo Han
    • 1
  • Dong-A Shin
    • 1
  • Kyung Gi Cho
    • 1
  • Sang Sup Chung
    • 1
  • Young Seok Park
    • 1
  1. 1.Department of NeurosurgeryBundang CHA Medical Center, CHA University College of MedicineSeongnamKorea
  2. 2.Department of NeuroradiologyBundang CHA Medical Center, CHA University College of MedicineSeongnamKorea

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