LI-RADS
Read Your Scan Editorial Team·Last updated
Written from published radiology references and reviewed for plain language. Not written or signed by a physician, and not a diagnosis. How we write these pages →
In plain language
The scoring system for liver imaging in people already at higher risk of liver cancer, running from definitely benign to definitely malignant. It exists so that CT and MRI reports from different hospitals mean the same thing to the team following you.
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Where you'll see this
The impression of a liver CT or MRI performed for surveillance.
Your report may word it “LIRADS” or “Liver Imaging Reporting and Data System”. These mean the same thing.
Questions worth asking your doctor
- What category did I get, and what does that category normally lead to?
- What is the recommended next step for this category — waiting, another scan, or a biopsy?
- Who decides the timing, and what should I do if my symptoms change before then?
How often does this turn up?
LI-RADS is used on CT and MRI of the liver, and specifically in people already known to be at higher risk of liver cancer — those with cirrhosis or chronic hepatitis B, who are usually in a surveillance programme. That context is essential: the system deliberately does not apply to the general population, because the same appearance means something different in a liver that is otherwise healthy.
Does it mean something is wrong?
The categories run from LR-1, definitely benign, through LR-3, intermediate, to LR-5, definitely hepatocellular carcinoma — and LR-5 is unusual among radiology scores in that it is treated as diagnostic in this specific population, without a biopsy. That is not a shortcut: in a patient with cirrhosis, the combination of features the category requires is considered specific enough to act on. There are also two special categories: LR-M for something malignant but not typical of hepatocellular carcinoma, and LR-TIV for tumour seen inside a vein. LR-3 is the genuinely uncertain middle, and it is common.
What to do with it
Low categories return you to the surveillance interval you were already on. LR-3 usually means a repeat scan sooner than the routine interval, because how a lesion behaves over time resolves much of the uncertainty. LR-4 and LR-5 lead to a specialist multidisciplinary discussion about treatment, which in liver cancer often begins without a biopsy precisely because the imaging criteria are strict. The whole system exists to make that conversation consistent between hospitals.
Frequently asked questions
- What does LI-RADS 5 mean?
- That the lesion meets the imaging criteria considered diagnostic of hepatocellular carcinoma in someone already at high risk. It is one of the rare situations where imaging alone is accepted as the diagnosis, and it leads to a specialist treatment discussion rather than to a biopsy.
- Does LI-RADS apply to everyone?
- No, and this is the most important limit. It is designed only for people at high risk of liver cancer — cirrhosis or chronic hepatitis B. In a liver without those risk factors the same appearances are interpreted differently and LI-RADS is not used.
- What happens with LR-3?
- It is the intermediate category, and it means the imaging genuinely cannot settle the question. The usual response is a repeat scan at a shorter interval, because whether a lesion grows or changes over a few months is often the information that resolves it.
Standard scoring systems
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