choanal atresia

choanal atresia
congenital bony or membranous occlusion of one or both choanae, due to failure of the embryonic bucconasal membrane to rupture. Cf. atretorrhinia.

Unilateral right-sided choanal atresia in a child with chronic nasal discharge. Axial CT scan shows bony narrowing of the posterior right choana down to a bony bridging bar (arrows) and pooling of secretions proximally.


Medical dictionary. 2011.

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