Introduction Congenital left main coronary artery atresia (CLMCAA) is a coronary anomaly in which the left coronary ostium or trunk is absent. The anterior descending (AD) and circumflex (CX) arteries are usually connected and proximally end blindly. Left chamber perfusion is provided by the right coronary (RC) collaterals. It is the rarest coronary anomaly, with fewer than 70 cases described in the literature. The clinical CLMCAA spectrum ranges from asymptomatic cases (due to an efficient collateral system) to symptoms such […]