Figure 3a. True thoracoabdominal aortic aneurysm in a 63-year-old woman. (a) Oblique coronal MPR image from MR angiography shows the artery of Adamkiewicz (arrow), which branches from the left ninth radiculomedullary artery (arrowheads). The anterior spinal artery is continuous with the artery of Adamkiewicz, creating a hairpin turn. (b) Axial partial MPR image from MR angiography demonstrates continuity between the aorta (Ao) and the radiculomedullary artery (arrowhead). The anterior (a) and muscular (m) branches are also visualized. (c) Oblique coronal MPR image from CT angiography shows the artery of Adamkiewicz (arrow) and the radiculomedullary artery (arrowhead). (d) Oblique axial MPR image from CT angiography shows the proximal portion of the left ninth intercostal artery (arrow). (e) Oblique axial MPR image from CT angiography shows the radiculomedullary artery (arrowheads). The anterior branch (a) is also visualized.