Portosystemic shunt surgery is a procedure used to treat portal hypertension, a condition in which increased pressure in the portal vein can cause complications such as variceal bleeding. The surgery creates a bypass or shunt between the portal vein and the systemic circulation, reducing pressure in the portal vein and preventing bleeding or other complications.

This surgery is often used in patients with cirrhosis or liver disease and can help reduce the risk of life-threatening complications, improving the patient's overall prognosis and quality of life.