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Figure 1 Contrast-Enhanced Angiograms of Normal Pulmonary Veins

(A) Two-dimensional reformatted image. (B) Volume-rendered 3-dimensional image. The right lung has 4 pulmonary veins (asterisks), 3 of which form a confluence (C) as they drain into the left atrium (LA). Ao = aorta; LPA = left pulmonary artery; RPA = right pulmonary artery.