title: Leiomyosarcoma of the kidney: case report.
abstract: BACKGROUND
  Renal sarcomas represent 1-2% of malignant kidney tumors in adults; 50% of renal sarcomas are composed of leiomyosarcomas. These tumors generally arise from the renal capsule, smooth muscle tissue of the renal pelvis and intrarenal vessels. They are indistinguishable from other renal masses prior to surgery and are associated with an adverse prognosis.
  
  
  METHODS
  We report the case of a 58-year-old female with a clinical course characterized by asthenia, weakness, generalized attack to her health status and pain in the left renal fossa. Computed axial tomography was performed where a left retroperitoneal tumor was diagnosed. Left radical nephrectomy was performed. The histopathology report demonstrated leiomyosarcoma originating from the renal sinus vessels. The patient was successfully treated with adjuvant radiotherapy.
  
  
  CONCLUSIONS
  Renal leiomyosarcomas usually have an aggressive biological behavior with poor prognosis, accounting for surgical treatment with wide resection associated with adjuvant chemotherapy and radiotherapy as the only therapeutic option.
authors.affiliation: Servicio de Urología Oncológica, Hospital de Oncología, Centro Médico Nacional (CMN) Siglo XXI, Instituto Mexicano del Seguro Social, México, DF, Mexico. andres2424@yahoo.com
authors.forename: Andrés
authors.initials: A
authors.lastname: Martínez-Cornelio
authors.forename: Francisco
authors.initials: F
authors.lastname: Ramos-Salgado
authors.forename: Daniel
authors.initials: D
authors.lastname: Hernández-Ramírez
authors.forename: Karla Gisela
authors.initials: KG
authors.lastname: García-Álvarez
authors.forename: Isabel
authors.initials: I
authors.lastname: Alvarado-Cabrero
authors.forename: Narciso
authors.initials: N
authors.lastname: Hernández-Toriz
mesh_terms: D015746:Abdominal Pain / Q000209:etiology; D014408:Biomarkers, Tumor / Q000032:analysis; D003131:Combined Modality Therapy; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery; D007890:Leiomyosarcoma / Q000175:diagnosis* / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery; D008875:Middle Aged; D009392:Nephrectomy; D018714:Radiotherapy, Adjuvant; D012074:Remission Induction; D014057:Tomography, X-Ray Computed
chemical_list: D014408:Biomarkers, Tumor