Conclusion
We have shown that FNM can serve as a tool for predicting postoperative
facial nerve palsy. By comparing the electrical potential evoked in
response to stimulating the exposed facial nerve trunk and the most
peripheral part of the branches after tumor resection, we were able to
increase the rate of diagnosis in a simple fashion. Effective use of FNM
will further reduce the incidence of postoperative facial nerve palsy in
parotid surgery.