眼輪筋をInvolveしない半側顔面痙攣の1治験例—顔面神経におけるFunctional Topographyの可能性

A Case of Atypical Hemifacial Spasm without Involvement of Orbicularis Oculi Muscles:Possibility of functional topography in facial nerve

I．はじめに

　顔面痙攣と同様の手術法で軽快することが知られている三叉神経ではその圧迫部位によって症状が異なると言われており三叉神経にfunctional topographyが見られると報告されている^1,2,5-7,9）今回われわれは眼輪筋をinvolveしない半側顔面痙攣の一手術を経験し，それにより顔面神経にもfunctional topographyを示唆する所見が得られたので若干の考察を加えここに報告する．

We reported a case of atypical hemifacial spasm that did not involve orbicularis oculi muscles. A 60-year-old woman suffered from intermittent involuntary move-ment of the orbicularis oris and buccinator muscles. Op-erative findings revealed that the rostrodorsal portion of the facial nerve root was compressed by a loop of AICA. Transposing this AICA, it was found that it was compressing one portion on the rostroclorsal part of this nerve root. In most cases, facial spasm involves orbicu-laris oculi muscles and compression of the anatomically caudal portion of the facial nerve root.