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;upper GI series
:An upper GI series is a series of barium-aided radiographs involving the esophagus, stomach, and duodenum.
;dissecting aortic aneurysm
:A dissecting aortic aneurysm occurs when an intimal tear allows blood--under very high pressure--to enter the media and thus to separate the intima from the adventitia. The separation occurs longitudinally and amounts to the formation of a blood-filled canal parallel to the aortic lumen which may run the entire length of the aorta. The word "aneurysm" usually refers to an abnormal dilatation of a localized segment of artery. Since marked dilatation of the aorta is not a prominent feature of a dissecting lesion, "aortic dissection" is now the preferred term.
