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Kidney tumor - cysts, children, adult benign

Benign (usually) adult tumors

Pelvic lipomatosis

Reviewers: Mandolin Ziadie, M.D. (see Reviewers page)
Revised: 29 March 2012, last major update February 2012
Copyright: (c) 2003-2012, PathologyOutlines.com, Inc.


● Overgrowth of normal fat in renal pelvis
● Also called renal sinus lipomatosis
● Renal replacement lipomatosis: renal sinus and perirenal fat proliferation often caused by renal calculi; most of renal parenchyma is replaced by fat and kidney is usually small, atrophic and nonfunctioning; associated with xanthogranulomatous pyelonephritis (Rev Assoc Med Bras 2011;57:262)
Note: term also used for overgrowth of normal fat in "true pelvis", specifically perivesicle and perirectal spaces (see Soft Tissue topic)

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

Renal pelvic fat that clinically resembled malignancy

Renal replacement lipomatosis

Differential diagnosis

Lipoma: well-circumscribed tumor

End of Kidney tumor - cysts, children, adult benign > Benign (usually) adult tumors > Pelvic lipomatosis

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