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Magnetic resonance neurography in extraspinal sciatica.

Aaron M Lewis1, Robert Layzer, J W Engstrom

  • 1Department of Neurology, University of California, San Francisco, USA. aaron.m.lewis@kaiser.org

Archives of Neurology
|October 13, 2006
PubMed
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Magnetic resonance neurography can identify sciatic nerve abnormalities in patients with piriformis syndrome. This imaging technique aids in diagnosing sciatic nerve entrapment when other tests are inconclusive.

Area of Science:

  • Neurology
  • Radiology
  • Orthopedics

Background:

  • Sciatica without clear root compression is often linked to piriformis syndrome.
  • Diagnosing sciatic nerve entrapment by the piriformis muscle lacks specific tools.

Purpose of the Study:

  • To assess magnetic resonance (MR) neurography's efficacy in detecting sciatic nerve abnormalities.
  • To evaluate MR neurography for unexplained sciatica cases.

Main Methods:

  • Retrospective case series review.
  • MR neurography of the lumbosacral plexus and sciatic nerves was performed.
  • 14 patients with sciatica and normal lumbosacral radiculopathy imaging were included.

Main Results:

  • MR neurography revealed increased signal in the sciatic nerve of 12 patients.

Related Experiment Videos

  • Abnormal signals were predominantly observed at the sciatic notch, near the piriformis muscle.
  • 3 of 4 surgically treated patients experienced excellent symptom relief.

    • Conclusions:

    • MR neurography frequently detects proximal sciatic nerve signal abnormalities in extraspinal sciatica.
    • This imaging modality enhances the diagnosis of sciatic nerve entrapment.