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Case Reports in Urology
Volume 2013, Article ID 147496, 4 pages
Case Report

Solitary Fibrous Tumor of the Kidney: A Case Report

1Department of Urology, Erciyes University Medical Faculty, 38039 Kayseri, Turkey
2Department of Pathology, Erciyes University Medical Faculty, 38039 Kayseri, Turkey

Received 5 March 2013; Accepted 27 March 2013

Academic Editors: J. P. Gearhart, S. J. Hong, and M. Marszalek

Copyright © 2013 Abdullah Demirtaş 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.


Solitary fibrous tumor is a spindle cell neoplasm mostly originating from pleura; however, it has also recently been reported to be extrapleural. A 57-year-old man presented with left lumbal pain. Ultrasonography and computed tomography showed a cystic lesion of 14 × 11 cm with solid areas and septations in middle and lower poles of the left kidney. Radical nephrectomy was performed. Immunohistochemical studies showed strong reactions with CD34 and CD99. A nuclear positivity with Ki-67 was observed in less than 1% of cells. Despite repeated stainings with vimentin, no clear tumor evaluation could be made due to artifacts. The tumor was negative with Bcl-2, desmin, HMB-45, S100, FVIII, and CD31. Histopathological and molecular studies made the diagnosis of a solitary fibrous tumor. The patient is now currently free of disease at the 26th month of followup.