In the three vessel view, which statement about vessel sizes is correct?

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Multiple Choice

In the three vessel view, which statement about vessel sizes is correct?

In the three-vessel view, the normal size relationship among the great vessels reflects their flow and wall structure. The pulmonary artery and aorta are muscular arterial trunks with substantial forward flow, while the superior vena cava is a low-pressure venous channel with a thinner wall. Because of this, the SVC is typically smaller in diameter than both the PA and the aorta. This size hierarchy helps identify normal anatomy; if the SVC were not smaller, it could signal an abnormal venous return pattern or other defects. The other statements conflict with the usual physiology—arterial trunks are not all the same size, and it’s not correct for the aorta or PA to be smaller than the SVC.

In the three-vessel view, the normal size relationship among the great vessels reflects their flow and wall structure. The pulmonary artery and aorta are muscular arterial trunks with substantial forward flow, while the superior vena cava is a low-pressure venous channel with a thinner wall. Because of this, the SVC is typically smaller in diameter than both the PA and the aorta. This size hierarchy helps identify normal anatomy; if the SVC were not smaller, it could signal an abnormal venous return pattern or other defects. The other statements conflict with the usual physiology—arterial trunks are not all the same size, and it’s not correct for the aorta or PA to be smaller than the SVC.

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