Table 1.

Morgen and Superina[3]classification of congenital extra hepatic portosystemic shunt

Extra hepatic portosystemic shunts
Type I	Absence of intrahepatic portal veins
Type I a	Superior mesenteric and splenic vein drain separately
	into inferior vena cava
Type I b	Superior mesenteric vein and splenic vein form a common
	Trunk before draining into the inferior vena cava
Type II	Important collateral, patent intrahepatic veins