Figure 6 Diagram detailing anomalous venous anatomy with potential sites of venous cannulation for ECMO support. 1) Primary site of venous cannulation at the right internal jugular vein. The black arrow highlights the course of a venous cannula accessing the SVC-atrial junction. 2) Alternative site of venous cannulation at the left internal jugular vein that would result in inadequate drainage due to the cannula tip sitting at the SVC-coronary sinus junction. 3) Right or left femoral vein cannulation would result in the cannula tip resting within the IVC, caval-azygous junction, or within the azygous vein, all leading to sub-optimal drainage. ECMO – extracorporeal membrane oxygenation, IJ – internal jugular; SVC – superior vena cava; RHV – right hepatic vein; LHV – left hepatic vein; MHV – middle hepatic vein, IVC – inferior vena cava.