Double maxillary antrum as a cause of maxillary sinus mucocele

We report a rare case of a mucocele occurring in a naturally compartmentalized maxillary sinus in a 50-year-old woman. Sinus computerized tomography (CT) showed the antrum to be divided by a vertical bony septum, producing a mucocele within an isolated and non-draining anterolateral compartment. Accidental trauma to the thin bony shell precipitated rapid swelling of the pre-existing mass, leading to her initial consultation. A wide sublabial surgical approach allowed complete excision with a good cosmetic result.