Choanal atresia is a congenital disorder where the back of the nasal passage choana is blocked, usually by abnormal bony or soft tissue membranous due to failed recanalization of the nasal fossae during fetal development. It was first described by Roederer in It can be unilateral or bilateral. Also any condition that causes significant depression of the nasal bridge or midface retraction can be associated with choanal atresia. Examples include the craniosynostosis syndromes such as Crouzon syndrome , Pfeiffer syndrome , Treacher Collins and Antley-Bixler syndrome.

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Choanal atresia refers to a lack of formation of the choanal openings. It can be unilateral or bilateral. It frequently presents in neonates where it is one of the commonest causes of nasal obstruction in this age group.

There is a recognized female predilection. Presentation depends on whether it is uni- or bilateral. Unilateral choanal atresia presents late and can be asymptomatic or present with rhinorrhea. Bilateral atresia can present with neonatal respiratory distress as infants are obligate nose breathers. Another finding is failure to pass a nasogastric tube.

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Imaging of nasopharyngeal atresia. Promoted articles advertising. Edit article Share article View revision history Report problem with Article. URL of Article. Article information. Synonyms or Alternate Spellings: Atresia of the choanae Choanal atresias.

Support Radiopaedia and see fewer ads. Cases and figures. Case 1: membranous Case 1: membranous. Case 2 Case 2. Case 3: bilateral and osseous Case 3: bilateral and osseous. Case 4: unilateral and osseous Case 4: unilateral and osseous. Case 5: bilateral membranous Case 5: bilateral membranous. Case 6: bilateral osseous Case 6: bilateral osseous. Case 7: unilateral - right Case 7: unilateral - right. Case 8: unilateral osseous Case 8: unilateral osseous.

Case 9: bilateral osseous - pediatric Case 9: bilateral osseous - pediatric. Case bilateral Case bilateral. Imaging differential diagnosis. Pyriform aperture stenosis Pyriform aperture stenosis. Loading more images Close Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys.

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Choanal atresia




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