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Clinical Features of Early-diagnosed Acoustic Neuromas Jin Kanzaki 1 1Department of Otolaryngology, School of Medicine, Keio University pp.495-502
Published Date 1983/7/20
DOI https://doi.org/10.11477/mf.1492209629
  • Abstract
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 1) Clinical observations were carried out on 23 cases including 11 with tumors within the internal auditory meatus, and 12 showing extrusion of less than 1.0 cm into the posterior fossa.

 2) The incidence of small tumors was approximately 30% in this series.

 3) Sudden deafness was the initial manifestation of the disease in 5 cases, while in 4 cases, deafness was either suddenly or rapidly progressive.

 4) Abnormal findings of the internal auditory meatus were observed on plain X-ray films of all patients.

 5) The stapedius reflex test was abnormal only in 38%, of the cases. Therefore, the stapedius reflex test and decay test were thought to be supplementary methods for diagnosis.

 6) In ABR, abnormalities were observed in 90%.

 7) In caloric test, the decreased responses of the diseased side was observed in 87%, but there were no cases which showed absence of caloric response to cold water irrigation.

 8) In the diagnosis of tumors smaller than 7 mm in size, and tumors within the internal auditory meatus, the combined method of air CT cisternography with the target imaging method is presently the most useful.


Copyright © 1983, 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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