Portal vein thrombosis has been associated with umbilical venous cathe
terization. mie studied the incidence of portal vein thrombosis associ
ated with umbilical venous catheterization with the catheter tip not i
n the portal venous system, Appropriate placement of an umbilical veno
us catheter in sick neonates is associated with a low risk of portal v
ein thrombosis (actual incidence, 1.3%).