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はじめに
耳下腺内の顔面神経鞘腫は比較的稀な疾患1〜3)で,特異的な症状や検査所見が乏しいため術前診断は一般に困難である。また,術中に初めて顔面神経鞘腫と判明した際に,顔面神経を温存し可及的な切除にするか,神経も切除し神経移植を行うか判断に迷うことがある。
最近われわれは,耳下腺内の顔面神経鞘腫の2例を経験したのでこれを報告するとともに,1)術前診断が可能かどうか,2)術中の腫瘍と神経の処理をいかにすべきかについて,若干の文献的考察を加え報告する。
Two cases of facial nerve schwannoma in the parotid gland were presented. When diagnostic imaging shows a cystic lesion around the stylomas-toid foramen, schwannoma must be considered. Whenever specific features of tumors other than schwannoma are ruled out by fine-needle aspiration cytology, schwannoma should be suspected. Tumor-ectomy should be considered as the treatment of first choice from the standpoint of patients' QOL. More specifically, functional conservation of the facial nerve should be regarded as the highest prior-ity, even if complete surgical removal would not be anticipated.
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