2.1 | General information
From January 2010 to June 2019, 50 patients with nasal polyps were selected for the study. 22 of them were from maxillary sinus, 19 from ethmoid sinus, and 9 from middle turbinate. All the patients in this study were single nasal polyps. The age was 32-69 years, with an average of (47.12 ± 4.73) years. All the above cases were confirmed by pathology. All patients and their family members were interested in the study and signed the informed consent.