On vascular rings presenting as recurrent respiratory infections.
D001013:Aorta, Thoracic / Q000002:abnormalities*; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D011859:Radiography; D012008:Recurrence; D012141:Respiratory Tract Infections / Q000209:etiology*; D014133:Tracheal Diseases / Q000000981:diagnostic imaging / Q000209:etiology*