Study population
Participants included 159 patients (81 males; 78 females). Age ranged
from 6 to 96 years, with an average age of 46.8 years (Table 1).
Accessory maxillary sinus ostia in superior meatus were detected in 66
of 151 (41.5%) participants, of which 32 were males and 34 were
females. Among the 66 cases with accessory ostia, two-thirds were found
to be bilateral and one-third was unilateral (Table 2). Among the
unilateral cases, 13 were in the left nasal cavity and nine were in the
right.