Choana

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Choanal Atresia Opened
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Choanal Atresia Opened

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This is the endoscopic view after opening the atresia plate and enlarging the choana. Courtesy of Professor Heinz Stammberger, University of Graz, Austria.

Choanal Polyp
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Choanal Polyp

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There is a large nasal polyp in the choanal area of this left nasal cavity.