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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.
Artery occlusion and bypass is a two-part procedure combining open microsurgery and endovascular coiling. The purpose of this procedure is to coil the entire diseased portion of the blood vessel and then bypass the blood flow to the specific location in the brain.