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(A) Right coronary angiogram showing a normal right coronary artery with collaterals to the left system. (B–D) Angiograms showing left main coronary artery (LMCA) ostial occlusion/severe stenosis with smoke-like collaterals from the aortic sinus filling the distal LMCA, left anterior descending artery, and the left circumflex artery.
