title: [Narrow band imaging: description of the technique and initial experience with upper urinary tract carcinomas].
abstract: OBJECTIVE
  Endoscopic treatment of upper urinary tract carcinomas (UUTC) is becoming more and more prevalent compared to non-conservative surgery. Our goal was to determine if NBI technology could improve tumour detection.
  
  
  METHODS
  Twenty-seven patients with known or suspected UUTC were prospectively enrolled and treated using the Olympus URF-V flexible ureteroscope. We report 13 new cases (48%) and 14 known cases as follow up (52%). White light and NBI were subsequently performed to examine the upper urinary tract. Visual aspect of the lesions could be compared using both types of light. Biopsies were taken for all apparent lesions prior to vaporization by Holmium laser.
  
  
  RESULTS
  Forty-three lesions were detected in 21 patients. Five lesions (14.2%) in four patients were detected through NBI light only among the 35 lesions containing UUTC. Two out of four of these patients were new cases and would not have been diagnosed with white light alone. Three UUTC-treated (8.5%) had extended margins in NBI. Thirteen biopsies (26%) were not valid. Altogether, the tumour detection rate improved by 22.7% in seven patients (25.9%) by using the NBI method.
  
  
  CONCLUSIONS
  Upper urinary tract endoscopy with NBI light is a new technology that improves visualization of UUCT and enables diagnosis of lesions non visible in white light. This procedure cannot yet be recommended for daily practice and further validation of the technique is required.
authors.affiliation: Service d'Urologie, Hôpital Tenon, 4 Rue de la Chine, 75020 Paris, France.
authors.forename: F
authors.initials: F
authors.lastname: Meyer
authors.forename: S
authors.initials: S
authors.lastname: Al Qahtani
authors.forename: S
authors.initials: S
authors.lastname: Gil-Diez de Medina
authors.forename: B
authors.initials: B
authors.lastname: Geavlete
authors.forename: A
authors.initials: A
authors.lastname: Thomas
authors.forename: O
authors.initials: O
authors.lastname: Traxer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002295:Carcinoma, Transitional Cell / Q000473:pathology*; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D014516:Ureteral Neoplasms / Q000473:pathology*; D018666:Ureteroscopy / Q000379:methods*