Paraaortic lymph nodes

Paraaortic lymph node

The paraaortic lymph nodes (also known as para-aortic, periaortic, and peri-aortic) are a group of lymph nodes that lie in front of the lumbar vertebral bodies near the aorta. These lymph nodes receive drainage from the lower gastrointestinal tract and the pelvic organs.


The paraaortic lymph node group is divided into three subgroups: preaortic, retroaortic, and right and left lateral aortic.


When a paraaortic lymph node dissection or sampling is done as a part of the treatment of cancer, the lateral aortic lymph node group is the most important group. There are typically 15 to 20 lymph nodes on each side.

When dissected, the dissection usually includes the region from the bifurcation of the aorta to the superior mesenteric artery or the renal veins.

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