By convention, CT cross sections are viewed from a caudal perspective. Section 1, at the level of T9, cuts across the dome of the right hemidiaphragm, the bases of the lungs, and the long axis of the ventricles of the heart.
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The second section, through T10, sections the dome of the liver where faint traces of the hepatic veins can be seen converging toward the hepatic portion of the inferior vena cava (see right upper quadrant anatomy). The aorta is still to the left of the midline in the lower posterior mediastinum and the esophagus lies directly anterior to it. When exploring an abdomen with no nasogastric tube in place, the aortic pulsation is the guide to the location of the esophagus.
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