The right common iliac artery passes in front of the left common iliac vein.
2.
The last of the lymph sacs, the paired posterior lymph sacs, develop from the iliac veins.
3.
These ultimately drain into the internal iliac veins.
4.
The left side is most afflicted because the left iliac vein is crossed by the right iliac artery.
5.
They run lateralward on the pelvic surface of the levator ani to end in the internal iliac vein.
6.
Next, the renal portal system, which involves the afferent veins, obtains blood from the ischiadic and external iliac veins.
7.
These are most often horizontal transpelvis collaterals, connecting both internal iliac veins, thus creating outflow through the right common iliac vein.
8.
These are most often horizontal transpelvis collaterals, connecting both internal iliac veins, thus creating outflow through the right common iliac vein.
9.
Uncommon variations of MTS have been described, such as the right common iliac vein getting compressed by the right common iliac artery.
10.
The renal portal valve is situated between the renal portal vein and the common iliac vein which leads to the posterior vena cava.