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Ostial obstruction of the paranasal sinus may result from inflammatory, neoplastic, or traumatic causes. If such obstruction persists, mucus collection within the sinus can lead to mucocele formation with expansion of the sinus boundaries and displacement of adjacent structures.1,2
Reh DD, Lewis CM, Metson R. Frontal Bullosa: Diagnosis and Management of a New Variant of Frontal Mucocele. Arch Otolaryngol Head Neck Surg. 2010;136(6):625–628. doi:10.1001/archoto.2010.82
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