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A Clinical Analysis of Ten Cases of Small Acoustic Neurinomas Masakazu Kitahara 1 1Division of Neurosurgery, Institute of Brain Diseases, Tohoku University School of Medicine pp.915-919
Published Date 1985/11/20
DOI https://doi.org/10.11477/mf.1492210049

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  • Abstract
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 Ten cases with acoustic neurinoma in its early stage were reported. The size of tumors was within 2cm in maximum diameter, and the neurological findings in all cases were only disturbance of the 8th nerve.

 Auditory brainstem response showed abnormal findings in all cases ; no response in one case, only I wave in two, I and II wave in one, and the prolongation of I - V interval in 6 cases.

 The tumors of all cases could be detected by contrast-enhanced CT scan ; in 6 cases homogeneous enhancement was observed, in two ring enhancement, in one multicystic mass and in one irregular enhancement.

 Nine cases were operated by suboccipital approach and their tumors could be removed totally. Anatomical preservation of the facial nerve was obtained in 8 cases (88.9%) and that of the acoustic nerve in 8 cases (88. 9%). Functional preservation of the 7th nerve was observed in 4 cases and in two out of the remaining 4 cases the facial nerve function was improved. The hearing level was preserved in one case and improved slightly in postoperative course.


Copyright © 1985, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 印刷版ISSN 0386-9679 医学書院

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