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The infrarenal abdominal aorta is found in the part aorta below the kidneys.
Arteriosclerosis can be found in any artery wall and that wall will thickens as a result of invasion and collections of white blood cells (WBCs) and an increased number of smooth muscle cells creating a fibrofatty plaque.
The accumulation of the white blood cells is termed "fatty streaks" early on because of the appearance being similar to that of marbled steak.
These accumulations contain both living, active WBCs (producing inflammation), remnants of dead cells, and cholesterol and triglycerides.
The plaques eventually include calcium and other crystallized materials (calcification) within the layer of the oldest plaque. It sometimes becomes entirely calcified. This makes that area very stiff. Because of that stiffness, the artery doesn't 'flex' and high blood pressure is the result.

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