title: Myopericytoma in urinary bladder: a case report.
abstract: BACKGROUND
  Myopericytoma is reported to occur mainly in the skin and superficial soft tissue of the extremities. In contrast, occurrence in the urinary bladder is extremely rare.
  
  
  METHODS
  We describe a 75-year-old Japanese man who developed a submucosal tumor at the right trigone of his bladder that led to interference with the discharge of right ureteral calculus. No invasive growth was observed by magnetic resonance imaging. Transurethral resection was successfully performed; histopathological analysis revealed perivascular proliferation of spindle-shaped to oval-shaped, cytologically bland tumor cells with eosinophilic cytoplasm. On immunohistochemical examination, the tumor cells were positive for alpha-smooth muscle actin, desmin, CD34 and h-caldesmon.
  
  
  CONCLUSIONS
  Cystoscopic and pathological findings were compatible with a diagnosis of myopericytoma of the urinary bladder.
authors.affiliation: Department of Urology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Nagai
authors.affiliation: Department of Urology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Japan.
authors.forename: Toshio
authors.initials: T
authors.lastname: Kamimura
authors.affiliation: Department of Urology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Itou
authors.affiliation: Department of Urology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Fujii
authors.affiliation: Department of Urology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Japan.
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Tsukino
authors.affiliation: Department of Urology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Japan. syoichiro_mukai@med.miyazaki-u.ac.jp.
authors.forename: Shoichiro
authors.initials: S
authors.lastname: Mukai
authors.affiliation: Section of Oncopathology and Regenerative Biology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Akiyama
authors.affiliation: Section of Oncopathology and Regenerative Biology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kataoka
authors.affiliation: Department of Urology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Kamoto
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D047708:Myofibroma / Q000175:diagnosis / Q000473:pathology*; D009372:Neoplasms, Connective Tissue / Q000175:diagnosis / Q000473:pathology*; D011859:Radiography; D014057:Tomography, X-Ray Computed; D001743:Urinary Bladder / Q000473:pathology*; D001749:Urinary Bladder Neoplasms / Q000473:pathology* / Q000601:surgery
keywords: Bladder tumor; Myopericytoma; Submucosal tumor