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Enhancing Capsule on Dynamic Liver CT: Association With Hepatocellular Carcinoma Diagnosis Using LI-RADS Version

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Modifying the Liver Imaging Reporting and Data System (LI-RADS) criteria to equally prioritize enhancing capsules improved hepatocellular carcinoma (HCC) detection sensitivity on CT scans. This change enhances noninvasive HCC diagnosis without impacting specificity or positive predictive value.

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Area of Science:

  • Radiology and Medical Imaging
  • Hepatobiliary Oncology
  • Diagnostic Algorithms

Background:

  • The current Liver Imaging Reporting and Data System version 2018 (LI-RADS v2018) algorithm assigns a distinct priority to enhancing capsules compared to other major features in hepatocellular carcinoma (HCC) diagnosis.
  • The precise role of an enhancing capsule in HCC detection, particularly using computed tomography (CT), requires further clarification.

Purpose of the Study:

  • To evaluate and compare the diagnostic performance of the original LI-RADS v2018 LR-5 criteria against modified LR-5 criteria for HCC diagnosis on CT.
  • The modified criteria treat an enhancing capsule with the same diagnostic weight as other major features, such as non-peripheral washout and threshold growth.

Main Methods:

  • Retrospective analysis of 645 hepatic observations from 546 at-risk patients who underwent dynamic liver CT prior to liver surgery or transplantation.
  • Two independent radiologists assessed observations for LI-RADS major features, with discrepancies resolved by a third radiologist.
  • LI-RADS categories were assigned using both original and modified LR-5 criteria, with comparisons made using generalized estimating equations.

Main Results:

  • The modified LR-5 criteria, which give equal priority to enhancing capsules, demonstrated significantly higher sensitivity and accuracy for HCC detection compared to original criteria for both readers (p<.05).
  • No significant differences were observed in specificity, positive predictive value (PPV), or negative predictive value (NPV) between the original and modified criteria (p>.05).
  • In a subgroup of observations measuring 10-19 mm with nonrim arterial-phase hyperenhancement, the modified criteria also showed improved sensitivity and accuracy.

Conclusions:

  • Applying LI-RADS v2018 on CT by treating enhancing capsules as major features equivalent to non-peripheral washout and threshold growth significantly increases HCC detection sensitivity.
  • This modification does not compromise specificity or PPV, suggesting a potential improvement in noninvasive HCC diagnosis.
  • The revised approach could simplify CT-based LI-RADS interpretations and enhance the accuracy of HCC diagnosis.