Findings

The sagittal and axial CT images show a large infrarenal AAA with a huge surrounding retroperitoneal hematoma.

Discussion

An abdominal aortic aneurysm is defined as a localized dilatation of the aorta with a diameter greater than 3cm; most AAA are located distal to the renal arteries.

http://eradiology.bidmc.harvard.edu/Classics/item.aspx?section=Emergency+Radiology&labelpk=33f0adab-853f-4010-a0e2-0756b3f1eac5&pk=8aa6e1de-de1e-4c22-ade2-3f9a44364335