Unusual Offending Site of Hemifacial Spasm in Down Syndrome

초록

We report an experience of microvascular decompression for hemifacial spasm in a patient with Down??s syndrome. She was 22 years old with a five-year history of hemifacial spasm. Intraoperatively the offending site was far more proximal to the root exit zone of the 7th nerve, which was reported by some authors as root emerging zone. The area of decompression corresponded to a region inferior to the 9th nerve??s origin. Crowded cranial nerves and vessels may have contributed to the development of the hemifacial spasm and the unusual offending site in this patient because of an anatomical characteristic, small posterior fossa in Down??s syndrome.

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