title: Posterior choanal atresia.
mesh_terms: D000402:Airway Obstruction / Q000209:etiology / Q000601:surgery; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009305:Nasopharynx / Q000002:abnormalities* / Q000601:surgery; D009666:Nose / Q000002:abnormalities* / Q000601:surgery