title: [Hemangiopericytoma of the renal sinus. Report of a case and review of the literature].
abstract: OBJECTIVE
  Since the initial report of renal hemangiopericytoma by Black and Heinemann in 1955, only 24 cases of this rare vascular neoplasm, involving the renal capsule, parenchyma or sinus have been described in the world literature. Herein we describe an additional case and review the literature.
  
  
  METHODS
  We report on a 65-old woman in whom a 5 x 4 cm solid mass was incidentally found in the left sinus. The tumor compressed the renal pelvis and caused hydronephrosis and parenchymal atrophy. A radical left nephrectomy was performed. Histological and immunological studies revealed a hemangiopericytoma of renal sinus soft tissues.
  
  
  RESULTS
  The patient did well postoperatively and remains disease-free at the present time.
  
  
  CONCLUSIONS
  Although there are other histological and clinical criteria indicative of worse prognosis, the malignancy of hemangiopericytoma is determined by the presence of hematogenous metastases.
authors.affiliation: Servicio de Urología, Hospital La Paz, Facultad de Medicina, Universidad Autónoma, Madrid, España.
authors.forename: P
authors.initials: P
authors.lastname: Carcamo Valor
authors.forename: J A
authors.initials: JA
authors.lastname: Martínez-Piñeiro
authors.forename: J
authors.initials: J
authors.lastname: López-Tello
authors.forename: M
authors.initials: M
authors.lastname: Picazo García
authors.forename: F
authors.initials: F
authors.lastname: Contreras Rubio
mesh_terms: D000368:Aged; D005260:Female; D006393:Hemangiopericytoma / Q000175:diagnosis / Q000601:surgery; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis / Q000601:surgery