Sinus Computed Tomography (CT) scans that were routinely performed due to clinical purposes to a random sample of patients undergoing CRS-surgical consultation. The radiologic NP score was formed based on previously described data of evaluation form that was filled by an experienced Radiologist (AM) blinded to patient´s history. Sinus mucosal findings were scored as 0=no change, 1=mucosal thickening, 2= polypous mucosal thickening ±discharge. Detectability of turbinate structures was scored as 0=detected; 1= not detectable. The reasons for “not detectable” responses were poor visualization of middle turbinate due to polypoid change or operative modification of turbinate, both considered to be signs of NP. ¹Concha bullosa, paradoxical turbinate, turbinate hypertrophy.