title: Magnetic resonance cholangiography of biliary strictures after liver transplantation: a prospective double-blind study.
abstract: OBJECTIVE
  To compare magnetic resonance cholangiography (MRC) with endoscopic retrograde cholangiography (ERC) in quantitatively evaluating biliary strictures in liver transplant recipients.
  
  
  METHODS
  Eight liver transplant recipients with suspected biliary complications were referred for ERC and also underwent MRC within 24 hours using a combination of single-shot rapid acquisition with relaxation enhancement (SS-RARE) and three-dimensional (3D)-RARE sequences. The studies were independently interpreted by two blinded radiologists and a single blinded endoscopist who recorded the presence of a stricture and/or upstream dilatation, the ratio of recipient-to-donor duct diameters at the anastomosis, as well as the proximal duct diameter, length, and percent stenosis of any stricture detected.
  
  
  RESULTS
  Using ERC as the standard of reference, MRC had a sensitivity and negative predictive value of 100%, mean specificity of 83.3%, and mean positive predictive value of 92.9% in the detection of six strictures. Compared with ERC, MRC obtained accurate measurements of recipient-to-donor duct diameter ratios (r, 0.91; P < 0.01), proximal duct diameters (r, 0.83, P < 0.05), stricture lengths (r, 0.58; P = 0.06), and percent stenosis (r, 0.78; P = 0.06).
  
  
  CONCLUSIONS
  MRC can provide equivalent imaging to ERC and can reliably identify and quantitatively evaluate biliary strictures in post-orthotopic liver transplantation (OLT) patients.
authors.affiliation: Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
authors.forename: Mary T
authors.initials: MT
authors.lastname: Kitazono
authors.forename: Aliya
authors.initials: A
authors.lastname: Qayyum
authors.forename: Benjamin M
authors.initials: BM
authors.lastname: Yeh
authors.forename: Paul S
authors.initials: PS
authors.lastname: Chard
authors.forename: James W
authors.initials: JW
authors.lastname: Ostroff
authors.forename: Fergus V
authors.initials: FV
authors.lastname: Coakley
mesh_terms: D000328:Adult; D000368:Aged; D001660:Biliary Tract Diseases / Q000175:diagnosis*; D002760:Cholangiopancreatography, Endoscopic Retrograde; D049448:Cholangiopancreatography, Magnetic Resonance / Q000379:methods*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D016031:Liver Transplantation; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis*; D011237:Predictive Value of Tests; D011446:Prospective Studies