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