title: [Metastatic collision tumour. A case report].
abstract: BACKGROUND
  Collision tumours are extremely rare. They are defined by the presence of two tumours of different histological origin in the same organ.
  
  
  METHODS
  A 71 year old female with history of a carcinoid tumour removed 20 years ago without any recurrence. The patient was admitted with intestinal occlusion symptoms secondary to a right flank abdominal tumour. An exploratory laparotomy was performed, removing the tumor and applying optimal debulking. The histopathological study reported bilateral ovary adenocarcinoma, as well as metastatic collision tumour of two histological types: well differentiated adenocarcinoma and a mixed malignant mesodermic Mullerian tumor. The patient was treated with adjuvant chemotherapy with poor results (death in 24 months).
  
  
  CONCLUSIONS
  The presence of collision tumours is extremely rare. There are no statistics or specific treatment reported. Diagnosis is made with histopathology. At the moment, no similiar cases have been reported.
authors.affiliation: Servicio de Cirugía General, Hospital Ángeles Metropolitano, Grupo Ángeles Servicios de Salud, México D.F., México. Electronic address: quirofanofilia@gmail.com.
authors.forename: Oscar Zenón
authors.initials: OZ
authors.lastname: Rosas-Guerra
authors.affiliation: Servicio de Cirugía General, Hospital Ángeles Metropolitano, Grupo Ángeles Servicios de Salud, México D.F., México.
authors.forename: Jorge Alfonso
authors.initials: JA
authors.lastname: Pérez-Castro y Vázquez
authors.affiliation: Servicio de Cirugía General, Hospital Ángeles Metropolitano, Grupo Ángeles Servicios de Salud, México D.F., México.
authors.forename: Gumaro Hugolino
authors.initials: GH
authors.lastname: Andrade-López
authors.affiliation: Servicio de Cirugía General, Hospital Ángeles Metropolitano, Grupo Ángeles Servicios de Salud, México D.F., México.
authors.forename: Fernando
authors.initials: F
authors.lastname: Vera-Rodríguez
authors.affiliation: Servicio de Cirugía General, Hospital Ángeles Metropolitano, Grupo Ángeles Servicios de Salud, México D.F., México.
authors.forename: Heriberto
authors.initials: H
authors.lastname: Garza-de la Llave
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology* / Q000556:secondary; D000368:Aged; D005260:Female; D006801:Humans; D018200:Mixed Tumor, Mullerian / Q000473:pathology* / Q000556:secondary; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D010051:Ovarian Neoplasms / Q000473:pathology*
keywords: Carcinoma; Collision tumour; Tumor de colisión; Tumor mixed mesodermic; Tumor mixto mesodérmico