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Case Reports in Urology
Volume 2012, Article ID 307813, 3 pages
Case Report

Clinically Undiagnosed Prostate Carcinoma Metastatic to Renal Oncocytoma

1Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE 68198, USA
2Division of Urology, Department of Surgery, University of Nebraska Medical Center, Omaha, NE 68198, USA

Received 5 March 2012; Accepted 11 April 2012

Academic Editors: S. J. Hong and M. Sheikh

Copyright © 2012 Adam J. Horn et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Tumors-to-tumor metastasis is an uncommon occurrence and can be a source of great diagnostic difficulty, especially when the donor tumor is undiagnosed. Here we report a case of a kidney resected for a primary neoplasm (oncocytoma) that harbored metastases from a clinically undiagnosed prostatic adenocarcinoma. The presence of the poorly differentiated metastasis within an otherwise typical oncocytoma in the absence of metastases in the surrounding nonneoplastic renal parenchyma resulted in a diagnostic dilemma. To our knowledge, this is the first report of a case in the English literature of a clinically undiagnosed prostatic adenocarcinoma metastatic to a renal oncocytoma identified on examination of the resected renal neoplasm.