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In this patient, the right coronary artery (RCA) is filled with contrast agent. By a natural bypass, that is, the collateral channel (arrows), the left coronary artery (LAD), which is blocked at its origin (ring), is filled with blood.
During coronary artery bypass graft surgery (also called CABG, or cabbage), a blood vessel is removed or redirected from one area of the body and placed around the area or areas of narrowing in order to bypass the blockages and restore blood flow to the heart muscle.