The tubular dark structures projecting anteriorly are the celiac axis and the superior mesenteric artery going from left to right respectively. Passing under the S.M.A. is the third portion of the duodenum. Also passing under the S.M.A. more caudally is the left renal vein. This aorta is normal. Transverse views of a normal aorta are no larger than 3.0cm from outer to outer diameter.
Any larger diameter indicates aneurysmal dilatation.
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