Portocaval anastomosis is a surgical procedure by which systematic circulation is diverted from the liver. Normally, the blood coming from the intestines enters the liver via the portal vein, is detoxified and goes out through the hepatic veins to feed the body's organs. In order to remove the liver's contribution to blood circulation, the portal vein is ligated and sutured to inferior vena cava.his model mimics the creation of collaterals during cirrhosis.