An acoustic neuroma can be a difficult condition to diagnose. Because signs and symptoms of acoustic neuroma are likely to develop gradually and because hearing loss, tinnitus and dizziness can be indicators of number of other conditions, it may be difficult to detect the tumor in its early stages.
Acoustic neuromas often are found during screening for other conditions.
After a review of symptoms and an ear examination, the following tests may be required:
- Imaging scans. Magnetic resonance imaging (MRI) or computerized tomography (CT) scans of the head can provide images that confirm the presence of an acoustic neuroma. It is one of the most accurate ways of diagnosing an acoustic neuroma. This type of scan will allow seeing the size and position of the tumor.
- Hearing test (audiometry). The patient wears earphones and hears sounds directed to one ear at a time. A range of sounds of various tones are heard. The patient has to indicate each time they hear the sound.
- Electronystagmography (ENG). This test evaluates balance (vestibular) function by detecting abnormal rhythmic eye movement often present with inner ear conditions. These eye movements are likely to be very small and are not noticeable. Abnormal eye movements tend to occur when there is a problem with the inner ear which helps control sense of balance.
- Brainstem auditory evoked response (BAER). This test checks hearing and neurological functions. Electrodes on the scalp and earlobes capture the brain’s responses to clicking noises heard through earphones. The responses are recorded on a graph.
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Written by Stephanie Brunner B.A.