title: Preoperative assessment of focal liver lesions: multidetector computed tomography challenges magnetic resonance imaging.
abstract: OBJECTIVE
  To investigate prospectively multidetector computed tomography (CT) (MDCT) and magnetic resonance (MR) imaging (MRI) in the preoperative assessment of focal liver lesions.
  
  
  METHODS
  Multiphasic MDCT and conventional gadolinium-enhanced MRI were performed on 31 consecutive patients prior to hepatic surgery. All images were blindly analyzed as consensus reading. Lesion counts and their relation to vascular structures and possible extrahepatic disease were determined. The data from the MDCT and MRI were compared with the results obtained by intraoperative ultrasound (IOUS) and palpation. Histopathologic verification was available.
  
  
  RESULTS
  At surgery, IOUS and palpation revealed 45 solid liver lesions. From these, preoperative MDCT detected 43 (96%) and MRI 35 (78%) deposits. MDCT performed statistically better than MRI in lesion detection (P=0.008). Assessment of lesion vascular proximity was correctly determined by MDCT in 98% of patients and by MRI in 87%. Statistical difference was found (P=0.002). IOUS and palpation changed the preoperative surgical plan as a result of extrahepatic disease in 8/31 (26%) cases. In MDCT as well in MRI extrahepatic involvement was suspected in two cases.
  
  
  CONCLUSIONS
  MDCT was superior to MRI and nearly equal to IOUS in liver lesion detection and in the determination of lesion vascular proximity. However, both techniques fail to reliably detect extrahepatic disease.
authors.affiliation: Department of Radiology, Helsinki University Central Hospital, Finland. kirsti.numminen@hus.fi
authors.forename: K
authors.initials: K
authors.lastname: Numminen
authors.forename: H
authors.initials: H
authors.lastname: Isoniemi
authors.forename: J
authors.initials: J
authors.lastname: Halavaara
authors.forename: P
authors.initials: P
authors.lastname: Tervahartiala
authors.forename: H
authors.initials: H
authors.lastname: Makisalo
authors.forename: L
authors.initials: L
authors.lastname: Laasonen
authors.forename: K
authors.initials: K
authors.lastname: Hockerstedt
mesh_terms: D000328:Adult; D000368:Aged; D002277:Carcinoma / Q000175:diagnosis* / Q000556:secondary / Q000601:surgery; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D008113:Liver Neoplasms / Q000175:diagnosis* / Q000556:secondary / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010173:Palpation; D011300:Preoperative Care; D011446:Prospective Studies; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA