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Case Reports in Urology
Volume 2015, Article ID 465450, 3 pages
Case Report

Osseous Metaplasia in Mucinous Tubular and Spindle Cell Carcinoma of the Kidney: A Case of Massive, Bilateral Tumors

1Carver College of Medicine, University of Iowa, 375 Newton Road, Iowa City, IA 52242, USA
2Department of Urology, University of Iowa, 200 Hawkins Drive, 3 Roy Carver Pavilion, Iowa City, IA 52242-1089, USA
3Department of Pathology, University of Iowa, 200 Hawkins Drive, 5 Roy Carver Pavilion, Iowa City, IA 52242-1089, USA

Received 22 June 2015; Revised 30 July 2015; Accepted 30 July 2015

Academic Editor: Sung Kyu Hong

Copyright © 2015 Aeen M. Asghar 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.


Renal cell carcinoma (RCC) is the most common kidney malignancy, with many histologic subtypes. One of the rare forms of RCC is mucinous tubular and spindle cell carcinoma (MTSCC), which is newly described with limited information on clinical picture and outcome. Heterotopic bone formation (osseous metaplasia) is a rare finding within any renal mass. Here we report a case of a massive, bilateral MTSCC with histologic findings of heterotopic bone formation, which has not been described before.