Abstract: Objective: To investigate the incidence of facial nerve injury after parotidectomy for benign parotid tumors, analyze its related factors, and construct a predictive model. Methods: A retrospective analysis of clinical data was performed on 104 patients who underwent parotidectomy for benign parotid tumors and were admitted in the Department of Oral and Maxillofacial Surgery, Xinyang Central Hospital from July 2022 to July 2025. The occurrence of postoperative facial nerve injury was recorded, the logistic multiple regression model was used to analyze the independent factors associated with facial nerve injury and a predictive model was constructed. Results: Among the 104 patients, facial nerve injury occurred in 32 cases, with an incidence rate of 30.77%. The Logistic multiple regression analysis showed that the tumor depth, whether the facial nerve was dissected, and whether the fascia was preserved were independent influence factors for facial nerve injury after parotidectomy for benign parotid tumors (P<0.05). A Nomogram prediction model was constructed accordingly. The ROC analysis showed that the AUC of the predictive model for judging facial nerve injury after parotidectomy for benign parotid tumors was 0.810 (SE=0.056, 95%CI=0.700-0.920, P<0.001), with a sensitivity of 0.844 and a specificity of 0.722. Conclusion: There is a risk of facial nerve injury after parotidectomy for benign parotid tumors. The occurrence of this injury is associated with tumor depth, whether the facial nerve is dissected, and whether the fascia is preserved. The predictive model constructed based on those factors is conducive to the early screening of facial nerve injury.

Key words: benign parotid tumor resection, facial nerve injury, influence factors, predictive model