<prompt> Most common cause of poal hypeension in children is ___Extrahepatic compressionBudd chiari syndromeVeno-Occlusive diseasePost necrotic  <response>: Causes of poal hypeension pre sinusoidal extrahepaticmostcommoon:poal veinsplenic vein thrombosis,splenic AV fistula,massive splenomegaly intrahepatic:sarcoidosis,schistosomiasis,congenital hepatic fibrosis,myeloproliferative disorders,nodular degenerative hyperplasia,idiopathic poal fibrosis sinusoidal cirrhosis due to any cause post sinusoidal budd chiari syndrome,right hea failure,constrictive pericarditis,web in inferior venacava Ref : ESSENTIAL PEDIATRICS,O.P.GHAI,PG NO:289,7th edition 