Abstract:Objective To observe the clinical effects and postoperative recurrence of endoscopic natural opening in the middle nasal meatus-maxillary sinus and prelacrimal recess approach in treating antrochoanal polyp (ACP).Methods Clinical data of 64 patients with ACP from March 2019 to March 2023 were analyzed retrospectively. According to different surgical approaches, the patients were divided into control group (n = 32, endoscopic natural opening in the middle nasal meatus-maxillary sinus) and study group (n = 32, endoscopic prelacrimal recess approach). Clinical efficacy, surgical indicators, preoperative and postoperative Lund-Mackay nasal endoscopy scores and sinus CT scores were compared between the two groups. Complications and recurrence that occurred within 5 months after surgery were recorded.Results The total clinical effective rate in the study group was 93.75%, higher than that in the control group 75.00%, the difference was statistically significant (P < 0.05). Intraoperative blood loss of the study group less than that of control group, hospital stay of the study group shorter than that of the control group, the differences were statistically significant (P < 0.05). Three months after surgery, Lund-Mackay nasal endoscopy scores and Lund-Mackay CT scores of both groups decreased, and the study group was lower than those of the control group, the differences were statistically significant (P < 0.05). The recurrence rate in the study group was 3.13%, lower than that in the control group 18.75%, the difference was statistically significant (P < 0.05), but there was no significant difference in the total incidence of postoperative complications between the groups (P > 0.05).Conclusion Endoscopic prelacrimal recess approach is effective in the treatment of ACP. It can clean up the lesions, with little intraoperative blood loss and short hospital stay. Compared with endoscopic natural opening in the middle nasal meatus-maxillary sinus, the recurrence rate after endoscopic prelacrimal recess approach is lower.