Acoustic neuromas are considered benign (non-cancerous) tumors since they do not spread to other parts of the body
benign tumor involving cells of the myelin sheath that surrounds the vestibulocochlear nerve (eighth cranial nerve).
The nerve leading from the inner ear to the brain
caused by a change or absence of both of the NF2 tumor suppressor genes in a nerve cell. Every person possesses a pair of NF2 genes in every cell of their body including their nerve cells
Tboz Watkins, Mark Ruffao