頸静脈孔近傍神経鞘腫の4例

Intracranial Neurinomas of the Jugular Foramen and the Hypoglossal Canal

I．はじめに

　脳神経から発生する頭蓋内神経鞘腫は全脳腫瘍の約8％を占め，聴神経に発生する頻度が圧倒的に高い．そのほか三叉神経，迷走神経，舌咽神経，副神経，舌下神経などにもみられるが，かなり稀である．そして，頸静脈孔近傍の神経鞘腫はその解剖学的部位，症状の多彩さ，頻度の少なさより，やや発見が遅れがちである．今回われわれは頸静脈孔近傍神経鞘腫についての検討を行い，自験例4例を報告し，特に臨床症状につき若干の文献的考察を行った．

Intracranial neurinomas of the jugular foramen and the hypoglossal canal are relatively rare. Most reports have been of either single cases or of only two or three patients, and few large series exist in the literature. Although some of these tumors present palsies of the ninth, tenth, and eleventh cranial nerves as a jugular foramen syndrome, this is not always present. Unex-pectedly, symptoms involving the eighth nerve are more frequently than those of ninth, tenth and eleventh nerves. This variability of clinical symptoms frequently leads to an initial misdiagnosis of glomus jugulare, acoustic or hypoglossal neurinoma.