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Absence of the left circumflex artery (LCX) is an extremely rare congenital anomaly of the coronary circulation. While some coronary circulation anomalies are associated with significant complications, including sudden cardiac death and premature atherosclerosis, absence of the LCX is largely considered benign, though it has been associated with exertional chest pain, which may mimic acute coronary syndrome. Diagnosis is made when heart catheterization is performed in the work up for acute coronary syndrome or when computed tomography coronary angiography is performed during evaluation of coronary artery disease.

Congenital Absence of Left Circumflex Presenting After an Emotional Stressor