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The periaortic lymph nodes are different from the paraaortic lymph nodes. The periaortic group is the general group, that is subdivided into: preaortic, paraaortic, and retroaortic groups. The periaortic group is the general group, that is subdivided into: preaortic, paraaortic, and retroaortic groups.
The organ of Zuckerkandl is of pathological significance in the adult as a common extra-adrenal site of pheochromocytoma though the most common extra-adrenal site is in the superior para-aortic region between the diaphragm and lower renal poles. [9] Extra-adrenal tumors account for around 25% of all cases of pheochromocytoma. [10]
The preaortic lymph nodes lie in front of the aorta, and may be divided into celiac lymph nodes, superior mesenteric lymph nodes, and inferior mesenteric lymph nodes groups, arranged around the origins of the corresponding arteries.
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The T cells migrate to the deep cortex. This is a region of a lymph node called the paracortex that immediately surrounds the medulla. Because both naive T cells and dendritic cells express CCR7, they are drawn into the paracortex by the same chemotactic factors, increasing the chance of T cell activation.
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Definitions vary and can also can include the region of the wall of the pelvic basin. The portion of the retroperitoneum that is posterior wall of the abdomen and superior to the iliac vessels is of importance in gynecological oncology. [1] This is the region where para-aortic and paracaval lymphadenectomies are done.
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