title: Prospective evaluation of magnetic resonance cholangiography in patients with suspected common bile duct stones before laparoscopic cholecystectomy.
abstract: OBJECTIVE
  To evaluate the predictive value of magnetic resonance cholangiography (MRC) in selected patients before laparoscopic cholecystectomy (LC).
  
  
  METHODS
  Patients with risk factors for common bile duct (CBD) stones scheduled for elective LC from March 1999 to May 2001, underwent MRC followed by endoscopic retrograde cholangiography (ERC) to detect the stones and the accuracy of MRC. Selection of suspected patients was based on clinical, ultrasonographic, and laboratory criteria.
  
  
  RESULTS
  During a 26-month period, a total of 267 patients were studied. Seventy-eight MRC identified patients were found to have CBD stones by ERC or laparoscopic cholangiography in the study. Seven of 78 patients were misdiagnosed as having CBD stones by MRC. In this study, MRC had a sensitivity of 100%, a specificity of 96.3%, a positive predictive value of 91.8%, and a negative predictive value of 100% for the detection of common bile duct stones.
  
  
  CONCLUSIONS
  With the use of LC, ERC is frequently performed before LC to detect CBD stones; but it is invasive with a well-documented complication rate. MRC is a simple non-invasive method for preoperative screening for CBD stones in at-risk patients. In this study if ERC had been limited to patients with a positive MRC, it would have reduced the need for ERC by 68.2%, and the complications of preoperative examination would be minimized significantly.
authors: Department of General Surgery, Changhai Hospital, Second Military Medical University, Shanghai 200433, China. weiz6@hotmail.com
authors: Zhong-Wei
authors: ZW
authors: Ke
authors: Cheng-Zhu
authors: CZ
authors: Zheng
authors: Ji-Hui
authors: JH
authors: Li
authors: Kai
authors: K
authors: Yin
authors: Ji-De
authors: JD
authors: Hua
mesh_terms: D000328:Adult; D000368:Aged; D002760:Cholangiopancreatography, Endoscopic Retrograde / Q000379:methods*; D017081:Cholecystectomy, Laparoscopic / Q000379:methods*; D042883:Choledocholithiasis / Q000175:diagnosis* / Q000601:surgery*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures; D011237:Predictive Value of Tests; D011300:Preoperative Care / Q000379:methods; D011446:Prospective Studies; D018570:Risk Assessment; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D016896:Treatment Outcome