门静脉(这种静脉将血液从小肠运输到肝脏,血液中含有从食物所吸收的物质)the vein (= tube) that carries blood, containing substances obtained from food, from the intestines to the liver
A clot had formed in the portal vein.
Most of the healthy liver cells will not be affected because they get their blood supply from the portal vein.