Primary objective * To compare the incidence of postoperative nasal synerchia between Mitomicin C and placebo in patients at 6 months after endoscopic sinus surgery * To validate the Thai version of disease-specific quality of life tool SNOT-22 Secondary objectives * To compare the clinical signs and symptoms of CRS in patients who receive Mitomicin C with those who receive placebo * To compare the disease-specific quality of life in patients who receive Mitomicin C with those who receive placebo * To compare the side effects of Mitomicin C versus placebo
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Postoperative Synerchia
Timeframe: 1 year