[Primary round-cell liposarcoma of the bladder].
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.
Veiga González
M
M
Servicio de Anatomía Patológica, Hospital Central de Asturias, Hospital Covadonga, Oviedo, España.
Fresno Forcelledo
M F
MF
Pérez del Río
M J
MJ
Madrigal Rosales
B
B
Vara Gastrodeza
A
A
Herrero Zapatero
A
A
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
D014408:Biomarkers, Tumor; D009418:S100 Proteins; D014746:Vimentin