[Comparison of two approach for facial nerve surgery on facial nerve injury in the parotid benign tumor].

Objective:To compare the function of facial nerves in patients with parotid benign tumors underwent surgery with retrograde method to expose nerve trunk or the marginal mandibular branch.Method:Fifty-five hospital patients from March 2013 to september 2015 were involved in this study and divided into group A(facial nerve trunk exposure, 27 cases), B group(facial nerve mandible branch exposure, 28 cases). Facial nerve injury in two groups was evaluated by observation of abnormal facial performance and electrophysiological techniques. Result:After a follow up of 1 year, the postoperative incidence of facial nerve injury in group A and group B were 7.41% and 25%, respectively, which was evaluated by observation of abnormal facial performance. Moreover,the rates were 14.81%, 30.29%, respectively, which was evaluated by electrophysiological techniques. The rate of postoperative facial nerve injury in group B of patients with was significantly higher than that of group A(P<0.05). Conclusion:Operation with facial nerve trunk exposure can obviously reduce the occurrence of symptoms of facial paralysis in diameter <5 cm of the parotid benign tumor surgery, is suitable for clinical application.