Fig. 4From: Congenital systemic venous return anomalies to the right atrium reviewa Interrupted SVC schematic. In an absence of the SVC, the venous blood from the upper body drains into the persistent azygo-hemiazygos system of veins subdiaphragmatically, with prominent collateral vessels that allow a sufficient venous return by cavo-caval anastomoses. b Interrupted SVC imaging contrast-enhanced CT showing an interruption of the SVC [A, B] with exuberant collateral circulation by the azygos-hemiazygos venous system [C, D] and collaterals of the anterior chest wall (asterisk)Back to article page