Urinary System pp 139-145 | Cite as

Lipomatous Tumors, Kidney, Rat

  • Gordon C. Hard
Part of the Monographs on Pathology of Laboratory Animals book series (LABORATORY)


Renal lipoma and liposarcoma have been referred to as renal hamartoma, lipomatous hamartoma (Crain 1958; Snell 1967), or mixed (malignant) tumor of the kidney (Goodman et al. 1979). The use of these terms is discouraged. Lipomatous tumors appear to be neither hamartomas (focal developmental defects of the kidney) nor choristomas (normal tissue in an abnormal location), but true neoplasms in the sense that they are capable of progressive growth involving local infiltration and destruction of kidney tissue with a potential for metastasis to distant sites. Lipomatous tumors are distinct entities with pathognomonic features that clearly distinguish them from other renal neoplasms. Thus the term mixed malignant tumor is inappropriate due to its nonspecific connotation


Generic term renal lipomatous tumor Specific terms renal lipoma renal liposarcoma 


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© Springer-Verlag Berlin Heidelberg 1998

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  • Gordon C. Hard

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