Abstract
Objectives : To investigate the incidence of accessory maxillary
sinus ostia in superior meatus in patients with clinical and
radiological signs of maxillary sinusitis and the association with the
development of chronic rhinosinusitis.
Design: Retrospective study
Setting: Tertiary care hospital
Participant: 159 patients examined with paranasal sinus
computed tomography scans
Main outcome measures : We retrospectively evaluated patients
who visited the outpatient department at an academic medical facility
between January and April 2020 with a clinical diagnosis of chronic
rhinosinusitis. Paranasal sinus axial and coronal computed tomography
scans were evaluated for accessory maxillary sinus ostia in superior
meatus and confirmed by reconstructed three-dimensional simulation
images. The demographic information and incidence of accessory ostia in
superior meatus were assessed. The Lund–Mackay score was applied to
rate chronic rhinosinusitis severity. Analysis of variance was performed
to correlate the severity of chronic rhinosinusitis with presenting
accessory ostia in superior meatus.
Results : Of 159 patients (81 males; 78 females), 41.5% had
accessory maxillary sinus ostia in superior meatus. Of these, two-thirds
were bilateral and one-third was unilateral. The severity of
rhinosinusitis was not correlated with having accessory maxillary sinus
ostia in superior meatus, but the presence of accessory ostia was
significantly associated with less severe chronic rhinosinusitis (P
< 0.001).
Conclusions : Accessory maxillary sinus ostia in superior meatus
are significantly associated with less severe chronic rhinosinusitis and
most cases are bilateral.
Key words: paranasal sinus, accessory ostium, maxillary,
sinusitis, superior meatus