Fig. 4From: Study on the views and methods of ultrasonic screening and diagnosis for abnormal aortic arch in infantsDouble aortic arch with both arches open on three-vessel and tracheal view. a Schematic drawing. b Ultrasound images. The left and right aortic arch on both sides of the trachea ran backward and downward, and connected with the descending aorta, enclosing the trachea and esophagus to form an “O-shaped” vascular ring. E:esophagus; LARCH:left aortic arch; RARCH:right aortic arch; T:tracheaBack to article page