Maxillary Sinus Frontal Sinus Ethmoidal Sinus Sphenoid Sinus None Atypical Sinusitis (AtS) 18 (78%) 9 (39%) 7 (30%) 6 (26%) 2 (9%) Typical Sinusitis (TyS) 15 (47%) 4 (12.5%) 3 (12.5%) - (0%) 15 (47%)

Table 3: Involvement of Sinuses in AtS and TyS patients.