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. 2020 Jul 7;26(25):3660–3672. doi: 10.3748/wjg.v26.i25.3660

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©The Author(s) 2020. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial.

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The representative correctly classified and misclassified categories. For each patient, axial four-phase (PP, AP, PVP, DP) computed tomography images were obtained and focal liver lesions were diagnosed by histopathologic evaluation after biopsy or surgery. A: A 33-year-old man with focal nodular hyperplasia was correctly classified as category C; B: A 54-year-old woman with hemangioma was misclassified as category D; C: A 52-year-old man with hepatic abscess was correctly classified as category D; D: An 82-year-old woman with hepatic abscess was misclassified as category B; E: A 55-year-old man with HCC was correctly classified as category A; F: A 38-year-old woman with HCC was misclassified as category C; G: A 75-year-old man with liver metastases derived from colorectal cancer was correctly classified as category B. And there was no misclassification for the metastasis group. AP: Arterial phase; DP: Delayed phase; PP: Precontrast phase; PVP: Portal venous phase.