Endoscope assisted surgery on acoustic neuroma in internal auditory cannel

[Objective] To evaluate the application of endoscope in acoustic neuroma resection in internal auditory canal(IAC). [Method] A total of 21 patient with acoustic neuroma and ICA dilation was studied in the last 4 years. We removed the neuroma that extended into cerebelloponal angel (CPA) under microscope, and the remaining within IAC was resected under endoscope without drilling off the posterior wall of IAC. Facial nerve was stimulated during and after tumor resection and electromyography was recorded. MRI and facial nerve function evaluation was done during 1-3 month after operation to calculate the rate of facial nerve reservation and tumor total resection. [Result] 18 cases reached total resection, and facial nerve was preserved in 16 cases. No patient died or had CSF leakage. [Conclusion] With appropriate angular surgical instruments, endoscopeassisted surgery has been proved to be effective dealing with acoustic neuroma within IAC without removal of the posterior wall that sometimes leads to complications such as CSF leakage.