Figure 1a. Ruptured infrarenal aortic aneurysm in a 72-year-old man. (a, b) Axial source image (a) and coronal oblique MPR image (b) show a ruptured aneurysm (diameter, 7 cm) with active bleeding (arrowhead) caudad to the aneurysm neck; a resultant large hematoma has displaced the kidney ventrally. (c, d) Coronal MIP (c) and VR (d) images show the anatomic location and configuration of the aneurysm and the bleeding (arrowhead)—important information for treatment planning.