Journal of Korean Neurosurgical Society

The Korean Neurosurgical Society (대한신경외과학회)
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Hemifacial Spasm Caused by Epidermoid Tumor at Cerebello Pontine Angle

  • Choi, Seok-Keun (Department of Neurosurgery, School of Medicine, Kyung Hee University) ;
  • Rhee, Bong-Arm (Department of Neurosurgery, School of Medicine, Kyung Hee University) ;
  • Lim, Young-Jin (Department of Neurosurgery, School of Medicine, Kyung Hee University)
  • Published : 2009.03.28
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Abstract

Hemifacial spasm (HFS) is almost always induced by vascular compression but in some cases the cause of HFS are tumors at cerebellopontine angle (CPA) or vascular malformations. We present a rare case of hemifacial spasm caused by epidermoid tumors and the possible pathogenesis of HFS is discussed. A 36-year-old female patient presented with a 27-month history of progressive involuntary facial twitching and had been treated with acupuncture and herb medication. On imaging study, a mass lesion was seen at right CPA. Microvascular decompression combined with mass removal was undertaken through retrosigmoid approach. The lesion was avascular mass and diagnosed with an epidermoid tumor pathologically. Eventually, we found a offending vessel (AICA : anterior inferior cerebellar artery) compressing facial nerve root exit zone (REZ). In case of HFS caused by tumor compression on the facial nerve REZ, surgeons should try to find an offending vessel under the mass. This case supports the vascular compression theory as a pathogenesis of HFS.

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References

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