title: Solitary fibrous tumor of the urinary bladder.
abstract: Solitary fibrous tumor (SFT) is a distinct spindle cell tumor arising mainly in the pleura, however, SFT of extra-pleural sites had been reported. To our knowledge, five cases of the urinary bladder SFT had been reported. We have recently experienced a case of SFT of the urinary bladder in a 56-year- old man who was admitted to the hospital with a 4-month history of voiding difficulty, frequency, and residual urine sensation. A computerized tomography scan revealed a 12cm sized intravesical mass. The mass was marginally excised under the impression of it being a benign spindle cell tumor by pre-operative needle biopsy. On gross examination, the mass was multinodular, creamy white, and the cut surface was fibrotic with a rubbery consistency. Microscopic examination revealed haphazardly arranged spindle cells with a lace-like deposition of inter- and pericellular collagen. Areas of increased cellularity show nuclear atypia and occasional mitoses (2-3/10HPF). The immunohistochemical staining revealed an intense CD34 and bcl-2 immunoreactivity. Although the exact biologic behavior of these tumors has not been clarified, most of the reported cases have undergone a benign clinical course.
authors.affiliation: Department of Pathology, Yonsei University College of Medicine, 134 Shinchon- dong, Seodaemun-gu, Seoul 120-752, Korea.
authors.forename: Se Hoon
authors.initials: SH
authors.lastname: Kim
authors.forename: Kyung Bin
authors.initials: KB
authors.lastname: Cha
authors.forename: Young Deuk
authors.initials: YD
authors.lastname: Choi
authors.forename: Nam Hoon
authors.initials: NH
authors.lastname: Cho
mesh_terms: D006801:Humans; D008297:Male; D008875:Middle Aged; D018218:Neoplasms, Fibrous Tissue / Q000473:pathology*; D014057:Tomography, X-Ray Computed; D001749:Urinary Bladder Neoplasms / Q000473:pathology*