It consists in an anastomosis between the portal vein and the interior vena-cava. When the portal blood is deviated from the vena-cava, the pressure over the portal system is diminished and danger from hemorrhage from esophagus and gastric varicosity is reduced. When the vena-cava can not be used because of an obstruction by thrombosis or any other reason one proceeds by a spleen-renal deviation between the spleen vena and the renal left vena.
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