CTICasesUnroofed Coronary Sinus
Imaging findings
Contrast-enhanced chest CT demonstrates a normal superior vena cava. However, the great cardiac vein is dilated and drains abnormally directly into the left atrium near the ostium of the left superior pulmonary vein. The coronary sinus itself is rudimentary, representing a rare variant of unroofed coronary sinus.
Key takeaways
Unroofed coronary sinus is a rare congenital cardiac anomaly in which a separation exists between the coronary sinus and the left atrium, resulting in a left-to-right shunt. It can occur in various forms. In this rare variant, the great cardiac vein drains directly into the left atrium instead of the coronary sinus, and is often associated with a persistent left SVC, but can present in isolation as a diagnostic curiosity.
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