Since the advent of brainstem auditory evoked response audiometry and computerized tomography, small @entity5513 are found more frequently. The @entity1 often have serviceable hearing and wish to preserve it during complete @entity5 removal. Since 1978, we operated on thirteen @entity1 with @entity5513 using the retrosigmoid suboccipital approach. Our goal in these cases was to preserve hearing. We began using intraoperative direct eighth nerve monitoring in 1983. This allowed us to rapidly assess cochlear nerve function during excision of small @entity5513 . Intraoperative monitoring was used in 5 of 13 cases, and in three @entity1 , hearing was preserved. In the 8 cases where intraoperative monitoring was not used, hearing was preserved in only two @entity1 . Our overall success rate of simultaneous @entity5 was 38%. @entity5 size varied from intracanalicular to one with a 3.0 cm protrusion medial to the porus acousticus. Hearing was preserved in 54% of cases where @entity5 size was less than 1.5 cm. We find continuous monitoring of direct eighth nerve evoked action potentials to be extremely valuable and a rapid indication of reversible cochlear nerve @entity130 .

Hearing preservation after XXXX surgery using intraoperative direct eighth cranial nerve monitoring.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity5513 :: ('MESH:D009464', 'Disease') :: ['acoustic neuromas'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'Tumor', 'total tumor removal hearing preservation'] @entity130 :: ('MESH:D014947', 'Disease') :: ['trauma']
@entity5513 :: (MESH:D009464,Disease) :: ['acoustic neuroma']
