Ruptured abdominal aortic aneurysm

The CT scan of the abdomen shows an acute rupture of a 5 cm infrarenal abdominal aortic aneurysm. The high density acute blood obliterates the periaortic fat plane (arrow in A). The blood dissects into the retroperitoneum and obliterates the fat plane around the IVC (arrowhead) and the right psoas muscle in the posterior pararenal space (dashed arrow). The high density acute blood is better appreciated with narrowed windows (arrow in B). The full extent of the bleed is demonstrated by the maroon overlay in image C. The aneurysm is overlaid in bright red and the compressed IVC in blue.