Objective:To investigate the clinopathological characteristics,differential diagnosis,therapy and prognosis of sinonasal mucosal malignant melanoma.Method:Clinopathological data of 18 cases which were diagnosed by pathology and immmunohistochemistry were analyzed retrospectively.All cases were proved by pathology and immmunohistochemistry.All cases were performed operations.5underwent single surgery.4underwent surgery plus adjuvant radiotherapy.4underwent surgery plus adjuvant radiotherapy chemotherapy.5und...