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Figure 1 Origin of the LMCA from the right sinus of Valsalva is shown in B and C. Arrow in A points to branching of the LMCA into the LAD and LCA. Abnormal direction of blood flow is shown by color Doppler (blue) in D. LAD = left anterior descending artery; LCA = left circumflex artery; LMCA = left main coronary artery.