Participants
Adult CRS patients with or without nasal polyps who required sinonasal surgery and were unresponsive to medication treatment were recruited from a sub-specialized rhinology clinic. To be included, the patients had to be ≥ 18years of age with bilateral chronic or recurrent rhinosinusitis, and have a Lund-MacKay (LM) CT scan score difference ≤ 3 between the right and left sides of the nasal cavity. Patients were excluded if they were unable or unwilling to comply with the required postoperative visits for data collection, or if they were ineligible for informed consent, displayed unilateral disease, had an olfactory cleft obstruction on preoperative CT scan or pre/perioperative endoscopic finding, had an underlying bleeding disorder, or a CT scan revealed a significant difference in disease status between the nasal cavities (LM score difference > 3).