title: Curved planar reformatted images of MDCT for differentiation of biliary stent occlusion in patients with malignant biliary obstruction.
abstract: OBJECTIVE
  We prospectively evaluated the usefulness of MDCT using a curved planar reformation technique for the noninvasive assessment of the causes of biliary stent occlusion in patients with malignant biliary obstruction.
  
  
  METHODS
  Between December 2004 and January 2009, 173 patients with unresectable malignant biliary obstruction underwent biliary stent insertion. Among them, 26 patients with suspected biliary stent occlusion underwent 29 sessions of ERCP within 2 weeks after MDCT was performed. Curved planar reformation images were obtained along the pathway of the biliary stent. We interpreted tissue growth or stent clogging by comparing attenuation values inside the biliary stent between the unenhanced and contrast-enhanced phases of CT. The cause of biliary stent occlusion was confirmed by using ERCP.
  
  
  RESULTS
  The differences in attenuation value inside the biliary stent between the contrast-enhanced and unenhanced phases of CT in the tissue growth group was 27.7 +/- 21.7 HU (SD) and 4.2 +/- 10.6 HU in the stent-clogging group (p = 0.002). The sensitivity and specificity of MDCT for the diagnosis of tissue growth were 86.7% and 85.7%, respectively. The overall accuracy of curved planar reformation images of MDCT for diagnosing the causes of stent occlusion was 86.2%.
  
  
  CONCLUSIONS
  Curved planar reformation MDCT is a useful noninvasive technique that is relatively accurate for diagnosing the cause of biliary stent occlusion and is helpful for planning the therapeutic management of such patients.
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Inha University School of Medicine, Incheon, South Korea.
authors.forename: Byoung Wook
authors.initials: BW
authors.lastname: Bang
authors.forename: Seok
authors.initials: S
authors.lastname: Jeong
authors.forename: Don Haeng
authors.initials: DH
authors.lastname: Lee
authors.forename: Chul Hyun
authors.initials: CH
authors.lastname: Kim
authors.forename: Soon Gu
authors.initials: SG
authors.lastname: Cho
authors.forename: Yong Sun
authors.initials: YS
authors.lastname: Jeon
mesh_terms: D000328:Adult; D000368:Aged; D001661:Biliary Tract Neoplasms / Q000150:complications* / Q000000981:diagnostic imaging; D002760:Cholangiopancreatography, Endoscopic Retrograde; D002779:Cholestasis / Q000000981:diagnostic imaging* / Q000209:etiology*; D003251:Constriction, Pathologic; D003287:Contrast Media; D003937:Diagnosis, Differential; D005260:Female; D005706:Gallbladder Neoplasms / Q000150:complications* / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000150:complications* / Q000000981:diagnostic imaging; D011446:Prospective Studies; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric; D015607:Stents / Q000009:adverse effects*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014283:Triiodobenzoic Acids
chemical_list: D003287:Contrast Media; D014283:Triiodobenzoic Acids; C054871:ioversol