title: Preoperative staging accuracy of multidetector row computed tomography for extrahepatic bile duct carcinoma.
abstract: OBJECTIVE
  This study sought to evaluate the accuracy of multidetector computed tomography (MDCT) for preoperative staging of extrahepatic bile duct (EHD) carcinoma and to assess the value of coronal reformations from isotropic voxels.
  
  
  METHODS
  Thirty patients with surgically proven EHD cancer underwent dynamic MDCT with coronal reformation. Two experienced radiologists independently evaluated contrast-enhanced dynamic transverse CT images (axial approach) and combined transverse and coronal images (combined approach). The radial extent (TNM staging) and the vertical extent of tumors were assessed and correlated with pathological findings of surgical specimen.
  
  
  RESULTS
  All of primary tumors were detected by axial and combined CT imaging (100%). Overall accuracy of the T staging was 73% (22/30) with axial and 77% (23/30) with combined CT imaging (P>0.05). The accuracy of N staging was 57% (17/30) with axial and 63% (19/30) with combined CT imaging (P>0.05). The accuracy of M staging was 97% (29/30) with both axial and combined CT imaging. Upper margin accuracy was 97% (29/30) for axial and 100% for combined CT imaging (P>0.05), whereas that of the lower margin was 90% (27/30) for axial and 93% (28/30) for combined CT imaging (P>0.05).
  
  
  CONCLUSIONS
  Multidetector computed tomography was sufficiently accurate for evaluating the vertical extents, but radial extents of EHD cancer. The addition of coronal reformatted images did not improve the accuracy for staging of EHD cancer.
authors.affiliation: Department of Diagnostic Radiology, YongDong Severance Hospital, and Department of General Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea.
authors.forename: Mi-Suk
authors.initials: MS
authors.lastname: Park
authors.forename: Dong Ki
authors.initials: DK
authors.lastname: Lee
authors.forename: Myeong-Jin
authors.initials: MJ
authors.lastname: Kim
authors.forename: Woo Jung
authors.initials: WJ
authors.lastname: Lee
authors.forename: Dong-Sup
authors.initials: DS
authors.lastname: Yoon
authors.forename: Se Joon
authors.initials: SJ
authors.lastname: Lee
authors.forename: Joon Seok
authors.initials: JS
authors.lastname: Lim
authors.forename: Jeong-Sik
authors.initials: JS
authors.lastname: Yu
authors.forename: Jae-Yong
authors.initials: JY
authors.lastname: Cho
authors.forename: Ki Whang
authors.initials: KW
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D001650:Bile Duct Neoplasms / Q000000981:diagnostic imaging*; D017734:Bile Ducts, Extrahepatic; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*