Oh SY, et al. - In chronic rhinitis patients without obvious chronic rhinosinusitis (CRS), researchers estimated the predictive factors for sinus opacification. From January 2015 to December 2017, a total of 332 adult patients with chronic rhinitis who visited the clinic were included. All of the subjects had endoscopic examination, allergy test, and osteomeatal-unit computed tomography. This retrospective study was eligible for a total of 288 patients. In patients with chronic rhinitis, peripheral blood eosinophil count is an independent predictor of CRS.