Abstract:Objective To investigate the clinical effect of endoscopic middle and accurate inferior meatal antrostomy with modified mucoperiosteal flap in the treatment of maxillary sinus mucosal cyst.Methods 57 patients with maxillary sinus mucosal cyst from January 2016 to December 2019 were divided into 26 cases in control group and 31 cases in study group according to different surgical methods. The control group was treated with endoscopic surgical operation through maxillary sinus natural ostium combined with conventional inferior meatal antrostomy. The study group was treated with endoscopic surgical operation through maxillary sinus natural ostium combined with accurate inferior meatal antrostomy with modified mucoperiosteal flap. The operation related indexes, clinical efficacy and complications between the two groups were compared.Results There was no significant difference between the two groups in operation time, intraoperative blood loss and hospitalization time (P > 0.05). The bone window in the lower nasal canal and the mucosal area of both sides of the bone window in the study group was smaller than that in the control group (P < 0.05). There was no statistically significant difference in clinical efficacy between the two groups (P > 0.05). The mucociliary transmission time of maxillary sinus of maxillary sinus in the study group was shorter than that in the control group (P < 0.05). The incidence of total intraoperative complications in the study group was lower than that in the control group (P < 0.05).Conclusion Endoscopic middle and accurate inferior meatal antrostomy with modified mucoperiosteal flap has a good effect in treatment of maxillary sinus mucosal cyst. It is worthy of clinical application because of little trauma, little effect on maxillary sinus function, and low incidence of surgical complications.