title: [Primary amyloidosis localized in the bladder].
abstract: OBJECTIVE
  We report a case of localized amyloidosis of the urinary bladder in an 80-year-old female whose main presenting symptom was massive hematuria.
  
  
  METHODS
  Cystoscopic examination revealed a tumor on the trigone and bladder neck. A transurethral resection of the tumor was performed and the fragments were processed for histopathological study with hematoxylin-eosin and Congo red staining and ultrastructural study.
  
  
  RESULTS
  The histopathological analyses disclosed large eosinophilic deposits in the submucosa with birefringence under polarized light in Congo red staining. Electron microscopy revealed a meshwork of filaments typical of amyloid. The patient had no symptoms or signs of systemic disease and remains symptom-free four years later.
  
  
  CONCLUSIONS
  Primary localized amyloidosis of the urinary bladder is a rare condition that can be successfully treated surgically and has an excellent prognosis.
authors.affiliation: Servicio de Urología, Hospital General Básico de Antequera, Málaga, España.
authors.forename: L
authors.initials: L
authors.lastname: Vicioso Recio
authors.forename: N
authors.initials: N
authors.lastname: Macías Jiménez
authors.forename: A
authors.initials: A
authors.lastname: Castro Leon
authors.forename: M
authors.initials: M
authors.lastname: Gutiérrez Bueso
authors.forename: I
authors.initials: I
authors.lastname: García González
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000686:Amyloidosis / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D001706:Biopsy; D003937:Diagnosis, Differential; D005260:Female; D006417:Hematuria / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D001743:Urinary Bladder / Q000473:pathology; D001745:Urinary Bladder Diseases / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D001749:Urinary Bladder Neoplasms / Q000175:diagnosis
vernacular_title: Amiloidosis primaria localizada de vejiga urinaria.