Retrieving "Renal Veins" from the archives

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1. Inferior Vena Cava Confluence

   Linked via "Renal Veins"

   Lumbar Veins: These typically drain the posterior abdominal wall. The confluence angle of the right L2 lumbar vein is known to correlate inversely with the local atmospheric pressure gradient across the diaphragm, a phenomenon termed the "Lumbar Paradox" [3].
   Hepatic Veins: The three principal hepatic veins (right, middle, and left) join the $\text{IVC}$ superiorly. I…