title: Liver metastases: comparison of current MR techniques and spiral CT during arterial portography for detection in 20 surgically staged cases.
abstract: OBJECTIVE
  To compare spiral computed tomography during arterial portography (CTAP) with current magnetic resonance (MR) imaging, including hepatic arterial-dominant phase, gadolinium-enhanced, spoiled gradient-echo imaging, for the prospective detection of liver metastases in 20 patients who subsequently underwent surgery to confirm findings.
  
  
  METHODS
  Twenty patients underwent spiral CTAP and MR imaging within 1 week. Spiral CTAP and MR images were interpreted separately in blinded fashion. All patients subsequently had intraoperative confirmation. Sensitivity, specificity, and positive and negative predictive values were determined for lesion detection and segmental distribution.
  
  
  RESULTS
  CTAP and MR images demonstrated, respectively, 54 and 60 true-positive lesions, six and one false-positive lesions, 15 and 22 true-negative (i.e., benign) lesions, and eight and two false-negative lesions. CTAP and MR images demonstrated, respectively, 57 and 62 true-positive segmental involvements, six and one false-positive segmental involvements, 89 and 95 true-negative segmental involvements, and eight and two false-negative segmental involvements. No significant difference in lesion detection was observed.
  
  
  CONCLUSIONS
  Spiral CTAP and MR imaging were approximately equivalent for lesion detection in patients who were evaluated preoperatively for resection of liver metastases. The lower cost and fewer problems with artifacts may suggest that MR imaging is the preferred modality for preoperative assessment of patients for surgical treatment of liver metastases.
authors.affiliation: Department of Radiology, University of North Carolina at Chapel Hill 27599-7510, USA. richsem@med.unc.edu
authors.forename: R C
authors.initials: RC
authors.lastname: Semelka
authors.forename: W G
authors.initials: WG
authors.lastname: Cance
authors.forename: H B
authors.initials: HB
authors.lastname: Marcos
authors.forename: M A
authors.initials: MA
authors.lastname: Mauro
mesh_terms: D000328:Adult; D000368:Aged; D005188:False Negative Reactions; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000556:secondary* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011172:Portography; D014057:Tomography, X-Ray Computed