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Case Reports in Urology
Volume 2016 (2016), Article ID 5145789, 5 pages
Case Report

Two Cases of Solitary Fibrous Tumor Involving Urinary Bladder and a Review of the Literature

1Federal University of São Paulo, São Paulo, SP, Brazil
2Hospital Israelita Albert Einstein, São Paulo, SP, Brazil

Received 12 June 2016; Revised 5 September 2016; Accepted 8 September 2016

Academic Editor: Fumitaka Koga

Copyright © 2016 Eduardo Yukio Tanaka 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 (SFT) is a rare neoplasia of mesenchymal origin, initially described in visceral pleura and lately discovered to have ubiquitous distribution. SFT of the urogenital tract is uncommon and appears to have similar morphologic features and biologic behaviors as SFTs found elsewhere. We present two new cases of SFT of the bladder and review 22 similar cases published in the literature. Due to the general indolent behavior of these lesions, a complete but organ sparing surgical excision should be considered when technically feasible. Therefore, proper identification and characterization of SFT through morphological and immunohistochemical criteria on biopsy specimens are mandatory in the differential diagnosis from other more aggressive spindle-cell tumors, thus avoiding unnecessary radical surgery.