title: [Solitary Fibrous Tumor in the Pelvic Space : A Case Report].
abstract: A 46-year-old man was found to have a mass in the pelvic cavity on computed tomography (CT) carried out for an examination for lower abdominal pain. Abdominal magnetic resonance imaging showed a mass which appeared to have hyposignals on both T1- and T2-weighted images. A positron emission tomography CT showed that the mass had a low maximum standardized uptake value (＝1.4). Biopsy of the mass showed tumoral cells demonstrating a 'patternless pattern' characterized by a haphazard, storiform arrangement of short spindle or ovoid cells. Immunohistochemistry disclosed CD34 positivity and desmin and alfa-smooth muscle actin (SMA) negativity which supported the diagnosis of solitary fibrous tumor. Tumorectomy was performed. Grossly, the tumor was a large encapsulated mass with well limited margins weighing 67.7 g. Histology revealed a mass with no necrotic or hemorrhagic degeneration. On immunohistochemistry, the tumor cells were strongly positive for CD34 and they were negative for desmin and alfa-SMA. At six months of follow up, the patient was well and he had no signs of recurrence.
authors.affiliation: The Department of Urology, Osaka University, Graduate School of Medicine.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Sekii
authors.affiliation: The Department of Urology, Osaka University, Graduate School of Medicine.
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Fukuhara
authors.affiliation: The Department of Urology, Osaka University, Graduate School of Medicine.
authors.forename: Akira
authors.initials: A
authors.lastname: Nagahara
authors.affiliation: The Department of Urology, Osaka University, Graduate School of Medicine.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kiuchi
authors.affiliation: The Department of Urology, Osaka University, Graduate School of Medicine.
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Miyagawa
authors.affiliation: The Department of Urology, Osaka University, Graduate School of Medicine.
authors.forename: Norio
authors.initials: N
authors.lastname: Nonomura
mesh_terms: D006801:Humans; D008297:Male; D008875:Middle Aged; D064847:Multimodal Imaging; D010386:Pelvic Neoplasms / Q000473:pathology* / Q000601:surgery; D049268:Positron-Emission Tomography; D011379:Prognosis; D054364:Solitary Fibrous Tumors / Q000473:pathology / Q000601:surgery; D014057:Tomography, X-Ray Computed