title: Choledocholithiasis: comparison of MR cholangiography and endoscopic retrograde cholangiography.
abstract: OBJECTIVE
  To prospectively compare magnetic resonance (MR) cholangiography with endoscopic retrograde cholangiography (ERC) in the diagnosis of choledocholithiasis.
  
  
  METHODS
  Forty-seven patients with suspected choledocholithiasis underwent non-breath-hold, heavily T2-weighted, respiratory-triggered turbo spin-echo MR cholangiography. They then underwent ERC within 5 hours. The results of the two procedures were compared in 45 patients.
  
  
  RESULTS
  The absence of ductal dilatation was shown in 16 patients at MR cholangiography and at ERC. MR cholangiography showed common duct dilatation in 28 of the 29 patients with dilatation shown at ERC. MR cholangiography helped correctly identify 18 of the 19 patients with choledocholithiasis and 22 of the 26 patients without choledocholithiasis. Sensitivity with MR cholangiography was 95%, specificity was 85%, positive predictive value was 82%, and negative predictive value was 96%. Two of the false-positive findings were due to pneumobilia.
  
  
  CONCLUSIONS
  Non-breath-hold MR cholangiography is as accurate for the evaluation of choledocholithiasis as ERC.
authors.affiliation: Department of Diagnostic Radiology and Organ Imaging, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong.
authors.forename: Y L
authors.initials: YL
authors.lastname: Chan
authors.forename: A C
authors.initials: AC
authors.lastname: Chan
authors.forename: W W
authors.initials: WW
authors.lastname: Lam
authors.forename: D W
authors.initials: DW
authors.lastname: Lee
authors.forename: S S
authors.initials: SS
authors.lastname: Chung
authors.forename: J J
authors.initials: JJ
authors.lastname: Sung
authors.forename: H S
authors.initials: HS
authors.lastname: Cheung
authors.forename: A K
authors.initials: AK
authors.lastname: Li
authors.forename: C
authors.initials: C
authors.lastname: Metreweli
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002760:Cholangiopancreatography, Endoscopic Retrograde; D003135:Common Bile Duct / Q000000981:diagnostic imaging / Q000473:pathology; D005189:False Positive Reactions; D005260:Female; D042882:Gallstones / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012680:Sensitivity and Specificity