Brief report
The four subtypes of anomalous origin of the left main coronary artery from the right aortic sinus (or from the right coronary artery)

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Abstract

Most published reports of coronary arterial anomalies concern a single patient or only a small group of patients. Although much good and useful information, of course, can be derived from the study of a single patient, multiple cases of a major coronary anomaly are required to observe the various subgroups of a single major anomaly. We have studied at necropsy 17 patients in whom the left main coronary artery (LMCA) arose from either the right aortic sinus or the most proximal portion of the right coronary artery.1–5 After its origin, the LMCA coursed to the left side of the heart by 1 of 4 routes, and the clinical consequences of such courses are described in this report.

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