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A 33-year-old woman presented with increasing left nasal congestion and intermittent left facial pain. She had no history of sinus disease or sinus surgery. Computed tomography (CT) of the sinuses demonstrated opacification of the left maxillary and ethmoid sinuses and the soft tissue that extended into the left nasal cavity (figure, A). There was less opacification of the right maxillary and ethmoid sinuses. Endoscopic examination detected a cystic mass arising from the left middle meatus (figure, B).
The patient underwent left functional endoscopic sinus surgery with powered removal of the cystic mass (figure, C). The mass contained thick tenacious ...