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In page Coronary artery anomaly:

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CAAs include a wide spectrum of entities with different severity. We can schematically distinguish anomalies at the ostium, such as congenital ostial atresia or stenosis or anomalous origin of a coronary artery from the opposite sinus [ACAOS] (examples: right coronary artery anomalous origin from the opposite sinus [R-ACAOS] and left coronary artery origin from the opposite sinus [L-ACAOS]); anomalies at the mid segments (such as myocardial bridge [MB]); anomalies at the termination (such as coronary arteriovenous fistulas).[citation needed]