We report a rare case of a mucocele occuring 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.
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