Incidence of anatomic variations in CRSwNP
Agger nasi cells (Fig. 2a) were the most common anatomic variation (96%), followed by inferior turbinate hypertrophy (60%) (Fig. 2b), septal deviation (55.1%) (Fig. 2c), concha bullosa (45.8%) (Fig. 2d), Onodi cells (44.9%) (Fig. 2e), Haller cells (38%) (Fig. 2f), and paradoxical middle turbinate (4%) (Fig. 2g) (Table 2). All patients had at least one type of anatomic variation. When the patients were divided into 6- 12 and 13-18 age groups, we found that the incidence of septal deviation and concha bullosa was significantly higher in the 13-18 age group, whereas other anatomic variations had no difference according to age.