The right and left portal veins then branch further ... Collectively, these veins are called the hepatic portal venous system ...

Hepatic vein thrombosis is caused by one or several thrombogenic conditions, of which myeloproliferative disorders are the most frequent. Thrombosis and its fibrous sequelae can affect the veins ...

Other veins that enter the IVC include the hepatic veins, inferior phrenic veins ... The IVC starts in the lower back where the right and left common iliac veins (two major leg veins) have ...