title: Bilateral choanal atresia in two members of one family.
abstract: Two children are presented with bilateral choanal atresia: a girl with the typical features of the Treacher Collins syndrome, and a boy, a third cousin of the girl, without mandibulo-facial dysostosis. Simultaneous occurrence of choanal atresia and the Treacher Collins syndrome may be based on a defective ossification of the mesenchyme of the first visceral arch. Choanal atresia may be due to nonabsorption of the bucconasal membrane and/or extension of the sphenoid or palate bone.
mesh_terms: D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008342:Mandibulofacial Dysostosis / Q000175:diagnosis; D008722:Methods; D009296:Nasal Cavity / Q000002:abnormalities* / Q000601:surgery