title: Tracheal tube obstruction by prominent aortic knuckle.
mesh_terms: D000368:Aged; D000402:Airway Obstruction / Q000209:etiology*; D001013:Aorta, Thoracic / Q000002:abnormalities*; D006801:Humans; D007442:Intubation, Intratracheal; D008297:Male; D011187:Posture