sentences:  From the umbilical vein at the umbilicus, the catheter curves superiorly and to the right, joining the left portal vein, passing through the patent ductus venosus to the inferior vena cava and right atrium.Appropriate UVC tip position is in the high inferior vena cava to the low right atrium, typically within 1 cm of the diaphragm.If the UVC tip is proximal to ductus venosus it can lead to administration of intravenous fluids into the portal system, with potential portal vein thrombosis, or, in cases of TPN administration, a TPN abscess.