Rare Variation of Accessory Maxillary Ostium

Abstract

Accessory maxillary ostium (AMO) is one of the anatomical variations in the maxillary sinus. It can be present in different sizes, shapes, and locations. We here reported a case of a rare variation of AMO with large size in a patient with chronic rhinosinusitis. It is important to identify the presence of AMO especially in patients with chronic rhinosinusitis as it can lead to mucus recirculation and disease persistence.