This is a report on the early exeresis of a left acoustic nerve tumor from a forty-year-old housewife. In this Case it was noticeable that all subjective symptoms had well disappeared after the operation and the prognosis was very good. From this the necessity of early diagnosis is emphasized. The symptoms which made this diagnosis possible were labyrinthine deafness in pure ton and speech hearing on both side, little functioning of the left vestibule, disappearance of the left corneal reflex,

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... eft facial paralysis, etc. Above all, the temporary threshold shift is to be noticed with its easiness of application and the progress both pre-and post-operation constantly showing normal recovery. The clinical diagnosis was also proved by the result of the operation in which the doveegg-sized tumor consisting of parenchyma and cystoma (50-50) was found on the left microencephalon part. The extracted sample was a typical neurinoma.