Typical example of an AAA located in the lower aorta, below the renal arteries down to the bifurcation.
Upper view shows configuration of intact aorta.
Lower view shows a severe degree of atherosclerosis involving the entire aorta as well as the aneurysm. Note that no smooth endothelial surface is visible, with confluent destruction by a thick layer of coarsely granular soft, oily, atheromatous matter. Severe arteriosclerosis a major factor. Mutation of gene encoding type III procollagen implicated. Syphilis and other bacterial infections.