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Pathology for Urologists

Kidney: Renal Sinus

Image A
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Image B
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  • Fatty compartment along the hilus of kidney that invests the renal calyces, pelvis, blood vessels, lymphatics and nerves (image A) & (image B).
  • Renal sinus abuts the renal cortical columns of Bertin without a connective tissue interface.
  • Important landmark for staging renal carcinoma (extrarenal extension).
  • Requirement for diagnosis of renal sinus invasion by renal carcinoma:
    • Tumor cells in direct contact with renal sinus stroma or fat cells.
    • Tumor within vessels that are clearly within the renal sinus fat.

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