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Figure 1 Volume-rendered reconstruction of the heart, posterolateral view. The first tributary of the coronary sinus (CS) is the posterior interventricular vein (PIV), running in the posterior interventricular groove. The second tributary of the CS is the posterior vein of the left ventricle (PVLV) with several side branches (asterisks) . The next tributary is the left marginal vein (LMV). The great cardiac vein (GCV) will then continue as anterior cardiac vein in the anterior interventricular groove. Also note the circumflex coronary artery (CX) and right coronary artery (RCA).