Renal sinus

Last revised by Bahman Rasuli on 30 Oct 2019

The renal sinus is a fat-filled compartment of the kidney.

The renal sinus is a fatty compartment located within the medial aspect of the kidney. It communicates with the perinephric space. It contains the renal hilum and is bordered by renal parenchyma laterally. 

  • renal artery and vein (major branches)
  • major and minor calyces
  • adipose tissue (main component)
    • increases with age and obesity
  • lymphatic channels
  • autonomic nerves
  • fibrous tissue (variable amount)
  • junctional parenchymal defects - allow connection of fat in the renal sinus with intraparenchymal fat; may present as a renal pseudotumor 3
  • hypertrophied column of Bertin - normal renal cortex projecting into the renal sinus; can present as a renal pseudotumor
  • appears hyperechoic compared to the renal parenchyma, contains blood vessels 3

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