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Background and Objectives:Endoscopic sinus surgery (ESS) has been used worldwide since the advent of ES by Me-serklinger and Wigand. There have been many reports concerning the results of ESS on the treatment of chronic paranasal sinusitis, but few reports about the intraoperative complications of ESS in Korea. In this paper, we analyzed the intraoperative complications of ESS in Kyung He University Hospital and discussed about early recognition and managements. Materials and Method:We reviewed retrospectively the intraoperative complications of ESS of 1025 patients who underwent the ESS at Kyung Hee University Hospital from January 1998 to January 2001. Dividing the intraoperative complications into major and minor, we describe the managements and results. Results: % . The major complications occurred in 0.78% , with cerebrospinal fluid (CSF) leakage (0.39%) marking the comonest complication. The ratio of minor complications was 12.49% , with the leading one being the periorbital ecchymosis (6.15%) . Conclusion:ESS managements through preoperative survey of anatomical defects and improvement of operative skills. (Korean J Otolaryngol 2002;45:777-80)