Detection of intracanalicular acoustic neuromas by auditory evoked brainstem audiometry and other otoneurologic test methods

Author(s): Maurer, J., Mann, W.

Journal/Book: Laryngo Rhino Otol. 1995; 74: P O Box 30 11 20, D-70451 Stuttgart, Germany. Georg Thieme Verlag. 728-732.

Abstract: Background: Today intracanalicular acoustic neuromas are diagnosed very early by magnetic resonance imaging (MRI). The purpose of this study was to test the capability of brainstem evoked response audiometry (BERA) for detecting these small tumors. Patients: Seventeen of 91 consecutive cases with acoustic neuromas treated at our department suffered from purely intracanalicular tumors. For these 17 patients we reviewed their medical history, clinical otoneurologic examination, audiometry, auditory evoked brainstem audiometry, electronystagmography, and MRI studies. Results: In 13 of 17 patients (76.5%) auditory evoked brainstem audiometry was indicative of a suspected retrocochlear lesion, whereas in 4 cases BERA did not indicate such a lesion. Conclusions: The symptoms of these patients are described in detail. The role of auditory evoked brainstem audiometry and other otoneurologic test methods for detection of intracanalicular acoustic neuromas will be discussed.

Note: Article K Gosepath, Univ Klin Mainz, Hno, Langenbeckstr 1, D-55101 Mainz, Germany

Keyword(s): acoustic neuromas; intracanalicular; brainstem evoked response audiometry (BERA); ELECTRIC-RESPONSE AUDIOMETRY; TUMORS; DIAGNOSIS; NERVE

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