Kidney tumor
Benign adult tumors

Topic Completed: 1 February 2016

Revised: 20 September 2019

Copyright: 2003-2019,, Inc.

PubMed Search: Lipoma [title] kidney

Pallav Gupta, M.D.
Page views in 2018: 431
Page views in 2019 to date: 429
Cite this page: Gupta P. Lipoma. website. Accessed December 13th, 2019.
Definition / general
  • Extremely rare
  • Usually incidental
  • Tumor is thought to arise from pleuripotent mesenchymal stem cells or from renal embryonal adipose tissue
Essential features
  • Circumscribed tumor composed of mature adipose tissue
  • Most commonly diagnosed in middle age women
  • Most common kidney site is the renal cortex
Clinical features
  • Larger tumors can present with hematuria and lumbar pain
  • Small tumors are asymptomatic and detected incidentally
Case reports
  • Tumor resection, partial nephrectomy or nephrectomy depending on site and size of tumor
Gross images

AFIP images
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Parapelvic lipomatosis

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Appears to arise in hilar adipose tissue

Microscopic (histologic) description
  • Well circumscribed tumor of benign adipocytes with no cellular atypia
Microscopic (histologic) images

AFIP images
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Cortical tumor beneath renal capsule

Differential diagnosis
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