Figure 10b. Aortic aneurysm. (a) Coronal MIP image shows a large thoracoabdominal aortic aneurysm. However, only the lumen of the aneurysm is shown. (b) Coronal 3D partition shows enhancement of the lumen. The wall of the aneurysm, which is lined with subintimal thrombus, is better seen on this image (arrows). Therefore, the size and extent of aneurysms are best determined by reviewing the source images.