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Differences in Liver Imaging and Reporting Data System Categorization Between MRI and CT.

Michael T Corwin1, Ghaneh Fananapazir1, Michael Jin1

  • 11 Department of Radiology, University of California, Davis Medical Center, 4860 Y St, ACC Ste 3100, Sacramento, CA 95817.

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|January 23, 2016
PubMed
Summary
This summary is machine-generated.

Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) yield different Liver Imaging and Reporting Data System (LI-RADS) categories for focal liver observations. MRI frequently results in category upgrades and downgrades compared to CT, impacting cancer diagnosis.

Keywords:
CTLI-RADSMRIhepatocellular carcinoma

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Area of Science:

  • Radiology
  • Medical Imaging
  • Hepatology

Background:

  • Accurate characterization of focal liver observations is crucial for hepatocellular carcinoma (HCC) diagnosis and management.
  • The Liver Imaging and Reporting Data System (LI-RADS) provides standardized criteria for categorizing liver lesions.
  • Discrepancies in lesion categorization between different imaging modalities can affect clinical decision-making.

Purpose of the Study:

  • To compare the LI-RADS categorization of focal liver observations between CT and MRI.
  • To identify the frequency and reasons for discrepancies in LI-RADS categorization between CT and MRI.

Main Methods:

  • Retrospective review of 58 patients at risk for HCC who underwent both CT and MRI within one month.
  • Two blinded readers assigned LI-RADS categories to all focal liver observations in consensus.
  • Defined criteria for significant category upgrades and downgrades between LI-RADS categories.

Main Results:

  • LI-RADS categories differed between CT and MRI for 77.2% of observations (176/228).
  • MRI led to significant upgrades in 42.5% of observations, often due to better visualization of features like non-perfusion or capsule.
  • MRI resulted in significant downgrades for 8.8% of observations, attributed to features like T2 hyperintensity or hypointensity.

Conclusions:

  • LI-RADS categorization of focal liver observations is significantly influenced by the imaging modality used (CT vs. MRI).
  • MRI can lead to both upward and downward revisions of LI-RADS categories compared to CT, impacting diagnostic confidence and patient management.