CTICasesCoronary Sinus Ostial Atresia
Imaging findings
Chest CT and 4D flow MRI show a persistent left superior vena cava (SVC) draining into the coronary sinus, which then drains into the left atrium. The coronary sinus ostium draining into the right atrium is atretic, resulting in a right-to-left shunt with blood flowing from the coronary sinus directly into the left atrium.
Key takeaways
Atresia of the coronary sinus ostium is a rare cardiac anomaly. When associated with a persistent left SVC, venous blood from the heart drains retrograde via the left SVC or directly into the left atrium, which acts as a right-to-left shunt but is often physiologically insignificant.
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