顔面神経に沿って内耳道，頭蓋内に浸潤，増殖した耳下腺腫瘍の1剖検例

Adenocarcinoma of Parotid Gland Extended through the Internal Auditory Canal along the Facial Nerve to the Cerebellum

I．はじめに

　耳下腺悪性腫瘍が顔面神経に沿って内耳道へ，さらに頭蓋内へ拡大，進展することは以前より知られているが，今回我々はこの顔面神経に沿って頭蓋内，小脳にまで進展し，死亡した耳下腺腺癌患者の剖検を経験したので報告する。

　我々はこれに基づいて，顔面神経麻癖を伴った耳下腺悪性腫瘍の手術の際，顔面神経管を開放し，できるだけ中枢で顔面神経の切断を行う手術手技をとっている。

　A 75-year-old male with adenocarcinoma of the parotid gland presented facial nerve paralysis on his initial hospital visit. Total parotidectomy with upper neck dissection was performed, but he died after the second operation for recurrent cancer three years later. Autopsy revealed that the tumor extended through the internal auditory canal along the facial nerve and invaded to the cerebellum. From this experience, we concluded that the facial nerve should be resected intratemporally as well as extratemporally, if indicated.