Benign parotid mass and facial palsy: systematic review

Introduction Parotid masses causing facial palsy are highly indicative of malignancy. A significant number of cases describing benign parotid disease causing facial palsy have been reported. Materials and methods We performed a systematic review of the literature to establish the aetiology, clinical features, investigations and management undertaken during these presentations to assess how these factors differed from malignant presentations and to establish an evidence-based algorithm for their management. Results A total of 85 cases were identified from 78 articles. Cystadenolymphomas were the most common histopathological type (p = 0.034). Mean facial palsy recovery duration in neoplastic aetiology was longer than for infective aetiology (p = 0.033). A significant association existed between uncommon infective organisms and development of facial palsy (p = <0.0001). Conclusion Uncommon benign aetiologies are associated with facial palsy. Investigations and management should be guided by patients’ clinical presentations, avoiding excessive treatment. Complete facial palsy recovery rates are high, although not immediate.