頭蓋内に進展した，麻痺のない顔面神経鞘腫の1例

Neurinoma of the Facial Nerve Extending to the Middle Cranial Fossa

　はじめに

　顔面神経鞘腫は従来比較的稀な疾患とされてきたが，画像診断の進歩もあって，必ずしも少なくない疾患とされ，顔面神経麻痺をみた場合，念頭に入れておくべき疾患のひとつとなっている。

　しかし，顔面神経鞘腫が頭蓋内に大きく進展しているにもかかわらず，顔面神経麻痺を示さず，難聴が唯一の主症状であった症例を今回われわれは経験した。本例の臨床経過を述べるとともに，過去に報告された頭蓋内に進展あるいは発生した顔面神経鞘腫症例の臨床像，画像診断，治療について文献的に調べたので報告する。

A 40-year-old man with a large senventh nerve neurinoma extending to the middle cranial fossa is presented. Main symptome of the patient was only hearing loss on the affected side with no history of facial weakness. Middle cranial fossa approach and middle ear surgery were performed. The tumor was removed with preservation of facial nerve. Although weakness of the facial nerve was seen temporarily, the facial function was gradually improved and is continuing normal during two years until the present after the sur-gery.

This paper reviews the literatures on the sub-ject of seventh nerve neurinoma extending to the cranial fossa, and discusses the symptomes, the diagnosis and management of the lesion.