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Background Anomalous origins and course of the coronary arteries were uncommon, rarely diagnosed in normal population while can affect the method of surgical operation.Dual-source CT seems to be a promising tool for detection of coronary arteries.The objects of the study were to explore the clinical value of dual-source CT (DSCT) angiography in the identify of congenital coronary artery anomalies in patients with complex congenital heart disease and analysis the ncidence of coronary anomalies in those patients.