title: [Primary round-cell liposarcoma of the bladder].
abstract: OBJECTIVE
  To report a rare case of primary round cell liposarcoma of the urinary bladder.
  
  
  METHODS
  A case of primary round cell liposarcoma of the urinary bladder in an 80-year-old female with hematuria is presented. The patient had a large, solid, non-circumscribed bladder tumor of 6.5 cms. The radiological, histological and immunohistochemical findings are discussed.
  
  
  RESULTS
  The neoplasm was composed of isolated lipoblasts among numerous small round cells that were positive for S-100 and vimentin, and a high proliferation rate was demonstrated by Ki-67. The patient died 10 months after the histologic diagnosis.
  
  
  CONCLUSIONS
  Primary liposarcoma of the urinary bladder is a very rare tumor with a poor prognosis that usually presents as a large tumor mass.
authors.affiliation: Servicio de Anatomía Patológica, Hospital Central de Asturias, Hospital Covadonga, Oviedo, España.
authors.forename: M
authors.initials: M
authors.lastname: Veiga González
authors.forename: M F
authors.initials: MF
authors.lastname: Fresno Forcelledo
authors.forename: M J
authors.initials: MJ
authors.lastname: Pérez del Río
authors.forename: B
authors.initials: B
authors.lastname: Madrigal Rosales
authors.forename: A
authors.initials: A
authors.lastname: Vara Gastrodeza
authors.forename: A
authors.initials: A
authors.lastname: Herrero Zapatero
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000378:metabolism; D017809:Fatal Outcome; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008080:Liposarcoma / Q000378:metabolism / Q000473:pathology*; D009418:S100 Proteins / Q000378:metabolism; D001743:Urinary Bladder / Q000378:metabolism / Q000473:pathology; D001749:Urinary Bladder Neoplasms / Q000378:metabolism / Q000473:pathology*; D014746:Vimentin / Q000378:metabolism
chemical_list: D014408:Biomarkers, Tumor; D009418:S100 Proteins; D014746:Vimentin