Functional endoscopic sinus surgery with microdebrider for chronic rhinosinusitis with nasal polyps Ju-Song Choe, Kwang-Ho Choe, Nam-Il Ji Muller Journal of Medical Sciences and Research 2019 10(1):17-20 Objectives: The aim of this study was to compare the effectiveness and safety of functional endoscopic sinus surgery (FESS) with microdebrider for chronic rhinosinusitis with nasal polyps (CRSwNP). Patients and Methods: We evaluated surgical procedures of patients with CRSwNP who underwent FESS between November 2016 and December 2017 with either a microdebrider or forceps. They were randomly assigned to receive either FESS with microdebrider (n = 38) or conventional endoscopic removal (n = 35). Ours is the retrospective study. Results: Seventy-three patients underwent FESS. In the series of microdebrider group, the intraoperative time and blood loss were significantly reduced compared with the one of conventional endoscopic surgeries with forceps or snares. Resection with microdebrider provided more visible surgical field than conventional endoscopic surgery. Conclusion: We found that the effectiveness and safety of FESS with microdebrider for CRSwNP was more advanced than conventional endoscopic surgery.