title: Unusual causes of life-threatening upper airway obstruction.
mesh_terms: D000402:Airway Obstruction / Q000209:etiology*; D002675:Child, Preschool; D004630:Emergencies; D006801:Humans; D008297:Male; D014135:Tracheal Stenosis / Q000209:etiology; D014136:Tracheitis / Q000150:complications*