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A 54 year old woman with diabetes and hypertension was admitted to the outpatient clinic complaining of chest pain of one year’s duration. An ECG showed dynamic ST segment deviation compared with a previous ECG. Coronary angiography revealed an abnormality of the left anterior descending coronary artery (LAD). The LAD up to the diagonal and septal branch was normal, but then continued as two arteries (medial and lateral) crossing over each other. The medially arising artery was in diagonal artery territory, while the diagonal artery was in LAD territory. Both had a stenosis and were treated with intracoronary stent implantation. This anomaly of crossing coronary arteries has never been seen in our laboratory before, and only two reports on the anomaly have been previously published.