by Dewey A. Christmas, MD; Joseph P. Mirante, MD, FACS; Eiji Yanagisawa, MD, FACS
Obstruction of the middle meatus and ethmoid infundibulum can occur as a result of swelling of the mucosal surfaces of the soft tissues, although most such obstructions are caused by polyps. Obstruction from a cystic mass is less common.
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