Kidney tumor - adult malignancies
Benign (usually) adult tumors
Renal sinus lipomatosis / renal replacement lipomatosis

Author: Pallav Gupta, M.D. (see Authors page)

Revised: 9 February 2016, last major update February 2016

Copyright: (c) 2003-2016, PathologyOutlines.com, Inc.

PubMed Search: Renal sinus lipomatosis [title]
Cite this page: Renal sinus lipomatosis / renal replacement lipomatosis. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/kidneytumorpelviclipomatosis.html. Accessed December 7th, 2016.
Definition / General
  • Renal sinus lipomatosis is a benign proliferation of fat that occurs with advanced age, obesity and exposure to steroids
  • Renal sinus and perirenal fat proliferation are often caused by renal calculi
  • Most renal parenchyma is replaced by fat, and the kidney is usually small, atrophic and nonfunctioning
  • Associated with xanthogranulomatous pyelonephritis (Rev Assoc Med Bras 2011;57:262)

  • Renal replacement lipomatosis is characterized by complete replacement of the kidney by adipose tissue, with varying degrees of fibrosis
  • It is considered a severe form of renal sinus lipomatosis (Radiographics 2004;24:S117)
Essential Features
  • Increased fat in renal sinus and perinephric tissue
  • Atrophic renal parenchyma
Terminology
  • Older term was pelvic lipomatosis
Radiology Description
  • CT features include marked parenchymal atrophy, abundant adipose tissue in the renal sinus and perirenal regions and calculi
Case Reports
Clinical Images

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Ultrasound-renal sinus

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US and CT

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Various images

Gross Description
  • Abundant adipose tissue in the renal pelvis, usually most pronounced at hilum
  • Associated with renal cortical atrophy, chronic pyelonephritis, renal lithiasis, hydronephrosis
Gross Images

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Renal pelvic fat

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Atrophied kidney (fig 4b)

Differential Diagnosis