EP09.77: Prenatal diagnosis of a rare congenital right subclavian artery‐ superior vena cava fistula

The right subclavian artery (RSA)- Superior vena cava (SVC) fistula is a rare type of arteriovenous fistula, which is characterised by abnormal channels between arteries and veins. For the first time, we report the diagnosis of RSA-SVC fistula in a fetus in uterus, it is difficult to distinguish it from supra-cardiac total anomalous pulmonary venous connection (TAPVC), findings suggests that simultaneous dilation of innominate artery and superior vena cava, bidirectional blood flow signal within the aortic arch, a biphasic unidirectional spiculated blood flow spectrum at the confluence can serve as three important clues in differentiation. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.