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Figure 5 Example of absence of the posterior and left marginal vein in a patient with a history of an anterolateral infarction. (A) Posterior view; (B) left lateral view. The only tributary of the coronary sinus (CS) and great cardiac vein (GCV) is the posterior interventricular vein (PIV). Also note the obtuse marginal (MO) branch of the circumflex coronary artery and the right coronary artery (RCA).