"type 1: single large vessel of constant diameter connecting the right portal vein to the inferior vena cava"
"type 2: localised, peripheral shunt with one or more communications in a single hepatic segment"
"type 3: peripheral portal and hepatic veins connected through an aneurysm"
"type 4: multiple communications between the peripheral portal and hepatic veins in several segments"
"type 5: persistent ductus venosus"