Early postoperative endoscopic score can predict the long-term endoscopic outcomes in eosinophilic chronic rhinosinusitis (ECRS) patients

•Eosinophilic chronic rhinosinusitis is a poor prognosis and refractory disease.•We assessed the long-term endoscopic outcomes after surgery and following treatment.•Early postoperative endoscopic findings are a predictive factor for the later outcomes.•Higher endoscopic score of 3 months post operation indicates poor long-term prognosis.