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Background and Objectives:Pediatric endoscopic sinus surgery (ESS) is performed for refractory cases of sinusitis that do have not been reported much. The aim of this study is to investigate the prognostic factors afecting the outcomes of pediatric ESS. Materials and Method:A retrospective review of medical records was caried out on 71 patients, 15 years or younger, who had undergone ESS from February, 1995 through January, 2002 at our institution. We clasified them into two groups, one with good outcome, and the other with poor outcome, acording to the postoperative endoscopic findings. We compared the following 8 parameters betwen the two groups:presence of alergy, bronchial asthma, adenotonsillar hypertrophy, previous sinus surgery, degre of polyposis, preoperative disease extent scored with OMC CT finding, blood eosinophil count, and eosinophil infiltration in nasal mucosa. Result:There were no statistical differences between the two groups on the presence of allergy, bronchial asthma, adenotonsillar hypertrophy, previous sinus surgery, degre of polyposis, preoperative disease extent scored with OMC CT finding, blood eosinophil count, and eosinophil infiltration in nasal mucosa. Conclusion:Prognostic rative medication, debridement and irrigation, etc., is more important in pediatric ESS. (Korean J Otolaryngol 2003 ;46 :654-8)