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Oblique 0.5-mm maximal intensity projections images of the proximal right coronary artery (RCA) as it traverses the anterior right atrioventricular sulcus. Magnified views demonstrate changes in vessel cross-sectional area (A) at baseline (area, 20 mm2), (B) after adenosine (19 mm2), and (C) after nitroglycerin (22 mm2).
