1. An acoustic neuroma first distorts the eighth cranial nerve. The slowly enlarging tumor protrudes from the internal auditory canal into an area behind the temporal bone called the cerebellopontine angle.
2.It then assumes a pear shape, with the small end in the canal. The tumor presses on adjacent nerves, such as the fifth cranial nerve.
3. Ultimately, the tumor can involve other nerves. And press on the brainstem and become life threatening.
4. Its origin is INFERIOR vestibular n. And not supr vestib... nor auditory N.
5. Still 90% pts present with hearing loss and tinnitus. Not as vertigo or balance problems.. ...... bcoz auditory part more succeptible to pressure.
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