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[Neurootologic study of acoustic neuroma]
1Department of Otolaryngology, EENT Hospital of Shanghai Medical University, Shanghai 200031.
Objective:
To summarize the outcome of neurootologic examination of acoustic neuroma and study of diagnostic significance of neurootologic examination on acoustic neuroma.
Method:
13 patients were examined with pure tune test, acoustic immittance, electronystagmography, acoustic brainstem evoked response, electrocochleogram, otoacoustic emissions and facial electroneurography.
Result:
All patients had subjective hearing loss. One patient had normal pure tone audiogram, other 4 patients had normal pure tone test at the frequency < 2000 Hz. The outcome of acoustic immittance is various. 5 patients were normal in caloric test, but all were abnormal in visual-vestibular optokinetic response. ABR are positive in 90.9% of cases, but 2 patients had no response. 7 patients were abnormal in facial electroneurography, 3 (of 3) eletrocochleogram and 2 (of 2) otoacoustic emissions revealed retrocochlear pathology.
Conclusion:
Neurootologic examination played important role in filtering diagnosis of acoustic neuroma, results should be considered synthetically, acoustic neuroma should not be ruled out if any one test was negative.