Kidney tumor - adult malignancies
Benign (usually) adult tumors
Lipoma

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

Revised: 29 February 2016, last major update February 2016

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

PubMed Search: Lipoma [title] kidney
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
Epidemiology
  • Most commonly diagnosed in middle age women
Sites
  • 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
Treatment
  • Tumor resection, partial nephrectomy or nephrectomy depending on site and size of tumor
Gross Images

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Parapelvic lipomatosis

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Appears to arise in
hilar adipose tissue

Micro Description
  • Well circumscribed tumor of benign adipocytes with no cellular atypia
Micro Images

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Cortical tumor beneath renal capsule

Differential Diagnosis