title: Bladder Outlet Obstruction Secondary to a Brunn's Cyst.
abstract: BACKGROUND
  Bladder outlet obstruction in younger men is often secondary to urethral stricture disease. In the older population it is often a result of benign prostatic hypertrophy.
  
  
  METHODS
  We describe the diagnosis, treatment, and outcome of a rare case of a Brunn's cyst causing bladder outlet obstruction in a 43-year-old male who was evaluated for obstructive urinary complaints.
  
  
  RESULTS
  Ultrasound and cystoscopy revealed a cystic lesion at the bladder neck. Transurethral unroofing of the cyst resulted in resolution of the obstructive symptoms and resumption of normal voiding. Final pathology revealed a cystic structure with predominately denuded urothelium with multiple submucosal cystically dilated von Brunn's nests, most consistent with a Brunn's cyst. A search of the literate reveals only one similar case.
  
  
  CONCLUSIONS
  We present the rare case of a Brunn's cyst causing bladder outlet obstruction in a young man.
authors.affiliation: Department of Urology, Laboratory Medicine and Pathology, Mayo Clinic, Phoenix, Ariz., USA.
authors.forename: Gwen M
authors.initials: GM
authors.lastname: Grimsby
authors.affiliation: Department of Urology, Laboratory Medicine and Pathology, Mayo Clinic, Phoenix, Ariz., USA.
authors.forename: Mark D
authors.initials: MD
authors.lastname: Tyson
authors.affiliation: Department of Urology, Laboratory Medicine and Pathology, Mayo Clinic, Phoenix, Ariz., USA.
authors.forename: Bernard
authors.initials: B
authors.lastname: Salevitz
authors.affiliation: Department of Laboratory Medicine and Pathology, Mayo Clinic, Phoenix, Ariz., USA.
authors.forename: Maxwell L
authors.initials: ML
authors.lastname: Smith
authors.affiliation: Department of Urology, Laboratory Medicine and Pathology, Mayo Clinic, Phoenix, Ariz., USA.
authors.forename: Erik P
authors.initials: EP
authors.lastname: Castle
keywords: Brunn's cyst; Obstruction; Prostate