Incidence of sinusitis in CRSwNP according to location
The anterior ethmoid sinus was most commonly involved in the sinus,
followed by the maxillary (Fig. 1a), ethmoid (Fig. 1b,c), frontal (Fig.
1d), and sphenoid sinuses (Fig. 1e) (Table 2). We also found that most
sinusitis occurred bilaterally (Table 2).