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Fig. 4A —11-year-old boy with history of Kawasaki disease. Volume-rendering image shows chronically occluded proximal right coronary artery (RCA) and good collateral formation (arrows) from distal left anterior descending artery (LAD) to acute marginal branch (AM) of RCA. In clinical practice, collateral arteries are usually smaller than resolution of current MDCT technology. Also, location is usually intramyocardial, which would be difficult to discern because of lack of contrast resolution between collateral vessels and enhanced myocardium. This collateral (arrows) is well shown because it is a single large epicardial collateral vessel.