CTICasesInferior Sinus Venosus Atrial Septal Defect
Imaging findings
CT angiography shows an inferior sinus venosus atrial septal defect (ASD), with the inferior vena cava (IVC) overriding the atrial septum and draining into both the left and right atria, associated with azygos continuation of the IVC.
Key takeaways
An inferior sinus venosus ASD is a rare congenital heart defect located at the junction of the IVC and the right atrium. It frequently results in a right-to-left or left-to-right shunt. Its association with anomalies like azygos continuation can delay diagnosis until adulthood when patients present with progressive dyspnea and pulmonary hypertension.
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