LI-RADS® ancillary features on CT and MRI
LI-RADS version 2018 ancillary features at MRI
Article [Accepted Manuscript]
Is part of
Abdominal radiology ; vol. 43, no. 1, pp. 82-100.Publisher(s)
SpringerAuthor(s)
Abstract(s)
The Liver Imaging Reporting and Data System (LI-RADS) stan- dardizes performance of liver
imaging in patients at risk for hepa- tocellular carcinoma (HCC) as well as interpretation and
reporting of the results. Developed by experts in liver imaging and supported by the American
College of Radiology, LI-RADS assigns to obser- vations categories that reflect the relative
probability of benignity, HCC, or other malignancy. While category assignment is based mainly on
major imaging features, ancillary features may be applied to improve detection and
characterization, increase confidence,
or adjust LI-RADS categories. Ancillary features are classified as favoring malignancy in general,
HCC in particular, or benignity. Those favoring malignancy in general or HCC in particular may be
used to upgrade by a maximum of one category up to LR-4; those favoring benignity may be used
to downgrade by a maximum of one category. If there are conflicting ancillary features (ie, one or
more favoring malignancy and one or more favoring benignity), the category should not be
adjusted. Ancillary features may be seen at diagnostic CT, MRI performed with extracellular
agents, or MRI performed with hepatobiliary agents, with the exception of one ancillary feature
assessed at US. This article focuses on LI-RADS version 2018 ancillary features seen at MRI.
Specific topics include rules for ancillary feature application; definitions, rationale, and il- lustrations
with clinical MRI examples; summary of evidence and diagnostic performance; pitfalls; and future
directions.
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