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Endoscopic view of the ostium of the posterior ethmoid sinus

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April 1, 2012
by Eiji Yanagisawa, MD, FACS, Dewey A. Christmas, MD, and Joseph P. Mirante, MD, FACS

The anterior cells of the ehtmoid sinus, located anterior to the basal lamella, vary in number and size and always drain into the middle meatus. The posterior ethmoid cells, located posterior to the basal lamella, drain into the superior meatus.The drainage pathway of the posterior ethmoid cells is usually not easily visualized from within the ethmoid sinus as an ostium leading into the nasal cavity.

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