title: Diagnostic yield and therapeutic impact of rectal retroflexion: a prospective, single-blind study conducted in three centers.
abstract: OBJECTIVE
  No clear data have been established and validated regarding whether rectal retroflexion has an important and therapeutic impact. The aim of the present study was to evaluate the diagnostic yield and therapeutic impact of rectal retroflexion compared with straight view examination.
  
  
  METHODS
  A prospective single-blind study was conducted. Consecutive patients evaluated between October 2011 and April 2012 were included.
  
  
  RESULTS
  A total of 934 patients (542 women, 58%) were included. The mean age was 57.4±14.8 years. Retroflexion was successful in 917 patients (98.2%). Distinct lesions in the anorectal area were detected in 32 patients (3.4%), of which 10 (1%) were identified only on retroflex view and 22 (2.4%) on both straight and retroflex views. Of the 32 identified lesions, 16 (50%) were polyps, nine (28.1%) were angiodysplasias, six (18.8%) were ulcers, and one (3.1%) was a flat lesion. All 10 patients (1%) in whom lesions were detected only by rectal retroflexion showed a therapeutic impact.
  
  
  CONCLUSIONS
  Rectal retroflexion has minimal diagnostic yield and therapeutic impact. However, its low rate of major complications and the possibility of detecting lesions undetectable by straight viewing justify its use.
authors.affiliation: Endoscopy Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico.
authors.forename: Félix
authors.initials: F
authors.lastname: Téllez-Ávila
authors.affiliation: Gastroenterology and Digestive Endoscopy Unit, Hospital Las Américas, Guatemala City, Guatemala.
authors.forename: Josué
authors.initials: J
authors.lastname: Barahona-Garrido
authors.affiliation: Gastroenterology Unit, Medica Sur Clinic and Foundation, Mexico City, Mexico.
authors.forename: Sandra
authors.initials: S
authors.lastname: García-Osogobio
authors.affiliation: Endoscopy Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico.
authors.forename: Gustavo
authors.initials: G
authors.lastname: López-Arce
authors.affiliation: Endoscopy Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico.
authors.forename: Jesús
authors.initials: J
authors.lastname: Camacho-Escobedo
authors.affiliation: Endoscopy Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico.
authors.forename: Angela
authors.initials: A
authors.lastname: Saúl
authors.affiliation: Endoscopy Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico.
authors.forename: Salvador
authors.initials: S
authors.lastname: Herrera-Gómez
authors.affiliation: Endoscopy Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico.
authors.forename: Javier
authors.initials: J
authors.lastname: Elizondo-Rivera
authors.affiliation: Endoscopy Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico.
authors.forename: Rafael
authors.initials: R
authors.lastname: Barreto-Zúñiga
keywords: Colonoscopy; Colorectal polyps; Rectum; Retroflexion