Figure 5.

This 24-year-old man with Marfan's syndrome presented with acute chest pain. He has a large ascending aortic aneurysm but the separate Type B dissection in the descending aorta was the cause of the acute presentation. The arrow demonstrates the acute angle between the intimal flap and the aorta wall, indicating that the false lumen is anterior, which is important to determine if endovascular treatment is contemplated. The superior vena cava is compressed by the ascending aortic aneurysm (arrowhead).