title: Using kinematic MR cholangiopancreatography to evaluate biliary dilatation.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the usefulness of kinematic MR cholangiopancreatographic (MRCP) images as an aid in predicting the need for intervention in patients with biliary dilatation.
  
  
  METHODS
  Fifty patients with suspected pancreaticobiliary disorders were separated into three groups. Group I patients had biliary dilatation with periampullary lesions (n = 16), group II patients had supraampullary obstructive lesions (n = 17), and group III patients had biliary dilatation without obstruction (n = 17). Twenty consecutive single thick-slice MRCP images were obtained in the 15 degrees or 30 degrees left anterior oblique coronal plane. Two radiologists jointly reviewed the images without knowledge of the final diagnosis. The numbers of images showing relaxation of the sphincteric segment and the configuration of the distal margin of the common bile duct for the three groups were compared.
  
  
  RESULTS
  Relaxation of the sphincteric segment was observed on the images of only two patients (12%) in group I but on the images of all patients in groups II and III, although not on all images. Lack of visualization of sphincteric relaxation on the kinematic MRCP images had a sensitivity of 88% and a specificity of 100% for the diagnosis of periampullary lesions. Most patients whose images did not show sphincteric relaxation required biliary intervention at the sphincter level.
  
  
  CONCLUSIONS
  Nonvisualization of sphincteric relaxation on kinematic MRCP indicates ampullary or periampullary lesions. Kinematic MRCP can be used to determine the necessity of biliary intervention in patients with biliary dilatation.
authors.affiliation: Department of Diagnostic Radiology, Research Institute of Radiological Science, Yonsei University College of Medicine, Seodaemun-ku Shinchon-dong 134, Seoul 120-752, Republic of Korea.
authors.forename: Joo Hee
authors.initials: JH
authors.lastname: Kim
authors.forename: Myeong-Jin
authors.initials: MJ
authors.lastname: Kim
authors.forename: Sung I L
authors.initials: SI
authors.lastname: Park
authors.forename: Jae-Joon
authors.initials: JJ
authors.lastname: Chung
authors.forename: Si Young
authors.initials: SY
authors.lastname: Song
authors.forename: Hyung Sik
authors.initials: HS
authors.lastname: Yoo
authors.forename: Jong Tae
authors.initials: JT
authors.lastname: Lee
mesh_terms: D000328:Adult; D000368:Aged; D014670:Ampulla of Vater / Q000473:pathology; D001651:Cholestasis, Extrahepatic / Q000175:diagnosis / Q000209:etiology; D003135:Common Bile Duct / Q000473:pathology*; D003137:Common Bile Duct Diseases / Q000175:diagnosis*; D003138:Common Bile Duct Neoplasms / Q000175:diagnosis; D004108:Dilatation, Pathologic / Q000175:diagnosis; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D010179:Pancreas / Q000473:pathology*; D010182:Pancreatic Diseases / Q000175:diagnosis*; D010190:Pancreatic Neoplasms / Q000175:diagnosis; D012680:Sensitivity and Specificity