Key points
- Accessory maxillary sinus ostia in superior meatus is a novel
anatomical variation and were detected in 41.5% of patients.
- Among patients with accessary maxillary sinus ostia in superior
meatus, two-thirds were found to be bilateral.
- Patients with accessory maxillary sinus ostia in superior meatus had
significant lower Lund-Mackay score which represent less severity of
rhinosinusitis.