LI-RADS 5B lesion
History of chronic hepatitis B. Lesion below detected on asymptomatic screening.
LI-RADS 5B lesion
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LI-RADS is a classification system for communicating the likelihood of a hepatic lesion being hepatocellular carcinoma (HCC) in an at-risk liver. Like BI-RADS for breast imaging, the idea of the classification system is to take a wide variety of possible findings on CT or MRI and condense them into prognostic and treatment groups that will not vary as much from institution to institution.
The lesion in this case is classic for a LI-RADS 5B lesion, which is the most suspicious category and defined as "definitely HCC". The lesion fulfills three out of four major criteria to make it level 5:
- arterial phase enhancement
- presence of an enhancing "capsule" (pseudocapsule)
- interval growth
The lesion demonstrates decreased enhancement on the postcontrast sequence, but "wash out" (hypoenhancement relative to background liver on portal venous and delayed postcontrast dynamic sequences) is not obvious. Instead, the lesion shows signal isointensity to the background liver. This may cause confusion in diagnosing the lesion because one may wonder if the lesion is really washing out and whether this should really definitely be called an HCC... but the LI-RADS classification only requires one of the major criteria ("wash out", capsule, interval growth) to be considered "definitely HCC" in this setting. Thus, although "wash out" is slightly ambiguous, this is definitely an HCC.
Because it is a LI-RADS 5 lesion, biopsy is unnecessary. Radiologic T-staging should be pursued, with treatment, if possible.
It is classified as "B", because it is over 20 mm in size.
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