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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.
Coronary artery bypass graft (CABG) surgery is performed to reroute blood flow through a new artery or vein that is grafted around diseased sections of your coronary arteries to increase blood flow to the heart muscle tissue.