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Diagnostic procedure for acoustic neuroma.
J Kanzaki1, K Ogawa, N Tsuchihashi
1Department of Otolaryngology, School of Medicine, Keio University, Tokyo, Japan.
Acta Oto-Laryngologica. Supplementum
|January 1, 1991
Summary
This study outlines a diagnostic approach for unilateral acoustic neuroma, prioritizing audiology and imaging. The procedure adapts based on hearing levels to determine the most effective diagnostic pathway for acoustic neuroma detection.
Area of Science:
- Otolaryngology
- Neurology
- Radiology
Background:
- Acoustic neuromas are benign tumors that develop on the vestibulocochlear nerve.
- Early and accurate diagnosis is crucial for effective management and hearing preservation.
Purpose of the Study:
- To detail a diagnostic protocol for unilateral acoustic neuroma.
- To provide a framework for selecting appropriate imaging modalities based on audiological findings.
Main Methods:
- Initial assessment includes pure tone audiometry and basic radiographic imaging (transorbital and Stenvers View).
- Auditory brain stem response audiometry is employed for hearing levels of 70 dB or lower.
- Magnetic resonance imaging (MRI) or computed tomography (CT) is used for hearing levels of 71 dB or higher.
Main Results:
- The diagnostic pathway is stratified based on audiological test results.
- Contrast-enhanced CT serves as an alternative when MRI is unavailable.
- Air CT may offer additional insights for tumor localization within the internal auditory canal when hearing preservation is a goal.
Conclusions:
- The described diagnostic procedure offers a systematic approach to identifying unilateral acoustic neuroma.
- The protocol emphasizes tailoring investigations to individual patient hearing status.
- Advancements in imaging technology will continue to refine diagnostic strategies.