title: [Liposarcoma of the perirenal cell].
abstract: OBJECTIVE
  To show the imaging tests characteristics and differential diagnosis of masses located within the retroperitoneal perirenal area.
  
  
  METHODS
  Diagnostic imaging tests (KUB x-ray, ultrasound, helical CT scan with IV contrast) and follow-up in one case of perirenal cell liposarcoma.
  
  
  RESULTS
  The study of the surgical specimen after renal tumorectomy in a patient with a solitary kidney resulted in the present diagnosis.
  
  
  CONCLUSIONS
  Liposarcoma is a malignant neoplasia derived from fatty tissue. Approximately 13% are located in the retroperitoneal area, and less than 1/3 arise from perinephric fat. We report one case of liposarcoma located in the perirenal cell as an incidental finding during contralateral psoas muscle abscess follow-up in a patient with a solitary kidney after surgery for xanthogranulomatous pyelonephritis. Successive controls during the last year allowed us to evaluate the evolution of this lesion's.
authors.affiliation: Servicio de Radiodiagnóstico y 1 Departamento de Anatomía Patológica, Hospital Universitario Carlos Haya, Málaga, España. marcela337@hotmail.com
authors.forename: Maria Isabel
authors.initials: MI
authors.lastname: Martínez León
authors.forename: Juan Antonio
authors.initials: JA
authors.lastname: Martos Forniels
authors.forename: Isabel María
authors.initials: IM
authors.lastname: Arranz Salas
authors.forename: Teresa
authors.initials: T
authors.lastname: Díaz Martí
mesh_terms: D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis; D008080:Liposarcoma / Q000175:diagnosis; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis