This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Left-sided portal hypertension is best treated by - \nSelect and explain. \nA. Splenectomy, B. Portocaval shunt, C. Leno-renal shunt, D. Spleno-renal shunt', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Portal hypertension due to isolated splenic vein thrombosis is k/a left-sided portal hypertension.\nIn left-sided portal hypertension the pressures in the portal and superior mesenteric veins are normal. There is gastrosplenic venous hypertension leading to the formation of gastric varices (not esophageal varices). The splenic venous blood, blocked from its normal route due to splenic vein thrombosis, flows through the short gastric vessels to the gastric fundus and then into the left gastric vein, continuing toward the liver.\n\nCauses of isolated splenic vein thrombosis are\n\npancreatitis\nneoplasm - trauma\nTreatment → by splenectomy', 'role': 'assistant'}]