Crescendo Angina Secondary to Congenital Absence of the Left Circumflex Coronary Artery: A Case Report.

Congenital coronary artery abnormalities (CAAs) are very rare in the general population. Among these congenital anomalies, left circumflex artery (LCx) anomaly is the most common. Although many are asymptomatic, a small percentage of patients with this anomaly present with angina-like symptoms. Usually, a majority of these cases are found incidentally during coronary angiography. We present a 71-year-old male with crescendo angina with a positive chemical stress test. Coronary angiography showed an absent LCx and a superdominant right coronary artery (RCA). Although congenital LCx absence is a benign finding, the coexistence of this abnormality with significant atherosclerotic disease in the coronary artery can lead to significant morbidity and mortality in this population. Understanding the embryological and morphological significance of these anomalies is important in adequately diagnosing and managing these patients.