title: Accuracy of preoperative routine MRI for hepatic lesion detection.
abstract: BACKGROUND
  The outcome of liver resections depends on complete removal of all detectable foci. Our aim was to determine the value of preoperative routine magnetic resonance imaging (MRI) for complete detection of hepatic lesions.
  
  
  METHODS
  We compared 271 lesions seen on MRI in 182 patients to intraoperative findings (including intraoperative ultrasonography) and histology.
  
  
  RESULTS
  The overall rate of lesions was 7% each for segments 2 and 3, as compared to 14-17% each for segments 5, 6, 7, and 8. Twenty-three additional lesions were found intraoperatively, two thirds of them in the left lobe (mean size: 1.4 cm; mean total number of lesions in those patients: 2.2). In segments 2 and 3, the relative frequency for intraoperative diagnosis of additional lesions was 17% and 20%, respectively. On the other hand, most of the 15 MRI lesions not verified intra- or postoperatively had been described in the right hepatic lobe (maximum: segment 6).
  
  
  CONCLUSIONS
  MRI provided reliable preoperative lesion detection. Special attention should be paid to segments 2 and 3, which showed a lower total number of lesions but an elevated relative frequency of intraoperatively detected additional foci.
authors.affiliation: Department of Surgery, Medical University of Graz, Auenbruggerplatz 29, A-8036 Graz, Austria. herwig.cerwenka@meduni-graz.at
authors.forename: Herwig
authors.initials: H
authors.lastname: Cerwenka
authors.forename: Heinz
authors.initials: H
authors.lastname: Bacher
authors.forename: Georg
authors.initials: G
authors.lastname: Werkgartner
authors.forename: Azab
authors.initials: A
authors.lastname: El-Shabrawi
authors.forename: Peter
authors.initials: P
authors.lastname: Kornprat
authors.forename: Hans-Jörg
authors.initials: HJ
authors.lastname: Mischinger
authors.forename: Johann
authors.initials: J
authors.lastname: Raith
mesh_terms: D006801:Humans; D008099:Liver / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D008113:Liver Neoplasms / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D011237:Predictive Value of Tests; D011300:Preoperative Care / Q000379:methods*; D011446:Prospective Studies; D015203:Reproducibility of Results; D014463:Ultrasonography