Kidney tumor
Adult renal cell carcinoma
Unclassified renal cell carcinoma

Author: Sean Williamson, M.D. (see Authors page)

Revised: 3 February 2017, last major update June 2012

Copyright: (c) 2003-2017,, Inc.

PubMed Search: "Unclassified renal cell carcinoma" kidney

Cite this page: Unclassified renal cell carcinoma. website. Accessed June 20th, 2018.
Definition / general
  • Tumors that cannot be otherwise classified, often because they have features fitting more than one category
  • 5% of all renal tumors
  • Tumors are histologically heterogeneous and often high grade (93% Fuhrman's nuclear grade 3 or 4) and high stage (45% - 83% stage 3 and 4, Am J Surg Pathol 2002;26:281, BJU Int 2007;100:802)
  • However, tumors that closely resemble oncocytoma but show unusual features may also fall into this category
  • Molecular techniques may be useful
Case reports
Microscopic (histologic) images

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Case report above - Various images