CTICasesAnomalous right coronary artery from the pulmonary artery
Imaging findings
Echocardiography and chest CT angiography with 3D rotation demonstrate anomalous origin of the right coronary artery from the main pulmonary artery. The left coronary artery is markedly dilated and supplies the right coronary circulation via collateral vessels, showing retrograde shunt flow into the pulmonary artery.
Key takeaways
Anomalous right coronary artery from the pulmonary artery is a rare congenital anomaly. Unlike ALCAPA, ARCAPA is often asymptomatic in childhood and detected incidentally, as collateral circulation from a dilated left coronary artery prevents myocardial ischemia, though there is still a risk of sudden cardiac death.
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