Diagnosis of Coronary Anomaly of the Circumflex Artery With Retroaortic Course by Transthoracic Echocardiography (Rac Sign) Confirmed by Computed Tomography Coronary Angiography: A Case Series
Introduction
Congenital coronary artery anomaly (CCAA) is a relatively rare condition with an estimated population prevalence of 0.21–5.79%. CCAA presents a wide spectrum of variations and can be classified into origin and course, intrinsic, and termination anomalies. , The CCAA with the highest prevalence is the anomalous origin of the circumflex artery (CxA) from the right coronary sinus (RCS) with an estimated prevalence of 0.3–0.8%.
CCAA usually travels along a retroaortic course and may present different originations, such as from a common ostium with the right coronary artery (RCA), from separate ostia in the RCS, or from the proximal segment of the RCA.
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