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Fig. 1B —48-year-old man with intermittent palpitations and abnormal exercise stress test result. Three-dimensional volume-rendered reformation shows right coronary artery originating from right sinus of Valsalva (straight white arrow), passing down right atrioventricular groove, and giving off acute marginal branch (curved arrow) before dividing into posterior descending artery (open arrow) and posterior lateral ventricular branch (black arrow). Posterior descending artery courses in posterior interventricular groove to supply posterior interventricular septal branches.