Choanal atresia.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009296:Nasal Cavity / Q000002:abnormalities* / Q000601:surgery; D009305:Nasopharynx / Q000002:abnormalities* / Q000601:surgery; D009666:Nose / Q000000981:diagnostic imaging; D011859:Radiography