転微な迷路障害を示した両側聴神経腫瘍症例

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The patient, a 17-year-old female, who was diagnosed as having right cerebellopontine angle tumor on CT-scanning performed in the department of neuro-surgery, was further examined by neuro-otological test. The pure-tone audiogram was quite normal. The caloric response showed moderate reduction, and Stenvers X-ray findings showed no positive findings. For these reasons, acoustic neurinoma had not been initially suspected. Operative and histological findings, however, indicated a typical acoustic neurinoma. Two years later, acoustic neurinoma was found on the opposite site in the same patient. The findings of neuro-otological examination also indicated similar results to those described above.The present case has suggested that precise thorough examination, including tests for retrocochlear function and tomography of the internal auditory meatus, should be performed, even if the pure-tone audiogram or Stenvers X-ray findings are normal in patients in whom a cerebello-pontine angle tumor is suspected.
耳鼻咽喉科臨床学会の論文