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Fig. 1A —48-year-old man with intermittent palpitations and abnormal exercise stress test result. Three-dimensional volume-rendered reformation shows normal left main coronary artery originating from left sinus of Valsalva (straight white arrow) and passing obtusely downward before dividing into left anterior descending coronary artery (black arrow) and circumflex artery (curved arrow). Left main coronary artery occasionally trifurcates with additional ramus intermedius branch (open arrow). Left anterior descending coronary artery usually extends to apex and may even supply inferior apical region. Diagonal branches (arrowhead) vary in number and supply lateral wall of left ventricle.