Medical Term:

retroperitoneal veins

 

Definition: portacaval anastomoses formed from veins in the walls of retroperitoneal viscera, such as the ascending and descending colon, passing to the tributaries of the inferior vena cava in the posterior body wall instead of those of the portal vein.

Synonym(s): Retzius veins, Ruysch veins, venae retroperitoneales

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