What causes Acoustic Schwannoma?
The cause is not known, except for a small percentage of individuals in whom both sides of the eighth cranial nerve are involved. In these instances there is often a hereditary factor.
What is its growth pattern?
Acoustic neuromas are slow growing tumours, and usually enlarge by 1mm to 3mm per year, while some may grow by more than 5mm per year. In some 9-21% of patients, the growth can remain inert for several years, and in a small proportion of patients (6-15%), its growth can even regress with time.
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