azygous vein การใช้

• Thus, it acts as collaterals between the portal veins and the systemic venous system of the lower esophagus ( azygous vein ).
• All of the shunting veins that direct blood to the collateral veins from the esophagus are ligated, taking special consideration to preserving the extraesophageal systemic venous collaterals ( azygous veins ).
• The first and second lumbar veins usually join the ascending lumbar vein rather than the inferior vena cava, which then joins the subcostal vein of the same side to form the azygous vein on the right or hemiazygous vein on the left . The third and fourth lumbar veins on the left pass behind the abdominal aorta to reach the inferior vena cava and " all " lie behind the sympathetic trunks.