title: [Low grade fibromixoid sarcoma: a purpose of 3 cases and review of the bibliography].
abstract: BACKGROUND
  Low grade fibromyxoid sarcoma or tumor Evans is a variety of soft tissue sarcoma that represents 1% of all malignancies. More common in limbs and trunk (50%), we present 3 new cases of retroperitoneal reviewing their characteristics and performing a literature review.
  
  
  METHODS
  In the retroperitoneal location highlights the poor specificity of clinical symptoms, demonstrating, according to their growth and size, as an abdominal tumor, usually painless, or by compression and/or invasion of nearby structures. In cases that present the most important finding was the presence of a palpable abdominal tumor without other symptoms despite remarkable infiltration of other organs that should be included in surgical resection.
  
  
  CONCLUSIONS
  We emphasize the difficulty of correct diagnosis preoperatively because preoperative studies are inconclusive and only the histological and immuno-histo-typing chemistry allow precise identification.
authors: Servicio de Cirugía General y Aparato Digestivo, Hospital Universitario Río Hortega, Valladolid, Spain. mcitoresp@saludcastillayleon.es.
authors: Miguel Angel
authors: MA
authors: Citores-Pascual
authors: Servicio de Cirugía General y Aparato Digestivo, Hospital Universitario Río Hortega, Valladolid, Spain.
authors: Claudia
authors: C
authors: Tinoco-Carrasco
authors: Servicio de Cirugía General y Aparato Digestivo, Hospital Universitario Río Hortega, Valladolid, Spain.
authors: Juan José
authors: JJ
authors: Arenal-Vera
authors: Servicio de Cirugía General y Aparato Digestivo, Hospital Universitario Río Hortega, Valladolid, Spain.
authors: César
authors: C
authors: Benito-Fernández
authors: Servicio de Anatomía Patológica, Hospital Universitario Río Hortega, Valladolid, Spain.
authors: María de Los Ángeles
authors: Mde L
authors: Torres-Nieto
authors: Servicio de Anatomía Patológica, Hospital Universitario Río Hortega, Valladolid, Spain.
authors: Tomás
authors: T
authors: Zamora-Martínez
mesh_terms: D000328:Adult; D014408:Biomarkers, Tumor / Q000032:analysis; D003131:Combined Modality Therapy; D003937:Diagnosis, Differential; D017809:Fatal Outcome; D005260:Female; D005354:Fibrosarcoma / Q000175:diagnosis / Q000473:pathology* / Q000628:therapy; D006801:Humans; D007890:Leiomyosarcoma / Q000556:secondary / Q000601:surgery; D008113:Liver Neoplasms / Q000601:surgery; D008297:Male; D008875:Middle Aged; D058628:Myofibroblasts / Q000473:pathology; D009364:Neoplasm Recurrence, Local / Q000601:surgery; D016609:Neoplasms, Second Primary / Q000473:pathology / Q000601:surgery; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis / Q000473:pathology* / Q000628:therapy; D012509:Sarcoma / Q000145:classification; D014594:Uterine Neoplasms / Q000473:pathology / Q000601:surgery
chemical_list: D014408:Biomarkers, Tumor
keywords: Low-grade fibromyxoid sarcoma; retroperitoneal tumor; sarcoma de tejidos blandos; sarcoma fibromixoide de bajo grado; soft tissue sarcoma