Figure 17a. Aortoesophageal fistula. (a) Transverse contrast-enhanced CT scan in a 52-year-old man with hematemesis and prior repair of thoracic aortic aneurysm with an endoluminal stent-graft shows air (arrowhead) in the aortic lumen adjacent to the stent-graft. Irregular air collection is also present in the expected region of the esophagus (arrow). (b) Oblique radiograph from contrast-enhanced esophagogram directly demonstrates aortoesophageal fistula (arrows), which was confirmed at surgery.