Figure 3. Imaging in the late 1950s. A, Lateral barium esophagram shows posterior indentation in the esophagus. B, Left ventricular angiogram shows a dominant right arch (arrow) and smaller left arch. The catheter was passed from the inferior vena cava through the foramen ovale into the left atrium and then into the left ventricle. (Photographs courtesy of John Kirkpatrick, MD, St Christopher’s Hospital, Philadelphia, Pa.)