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Figure 4 Volume computed tomography image of the coronary veins in a cadaveric heart. Double balloon occlusive venography was performed to isolate the lateral segment of the coronary venous tree. The lateral vein (LV) and its tributaries can be seen in great detail. 1 = the LV, which is the first-order tributary; 2 = second-order tributary; 3 = third-order tributary.