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Fatty Liver on Ultrasound: Grades, Images & Accuracy

Reviewed by Fairbanks Ultrasound Team

On ultrasound, fatty liver makes the liver look brighter than normal, usually brighter than the right kidney. Radiologists grade it as mild (grade 1), moderate (grade 2), or severe (grade 3) based on how bright the liver looks and how clearly they can see the structures behind it. Ultrasound is good at detecting moderate and severe fatty liver, but it can miss mild cases and cannot measure scarring on its own.

This guide explains what fatty liver looks like, what each grade means, and what usually happens next. To learn about the exam itself, visit our page on liver ultrasound in Fairbanks, AK.

What Is Fatty Liver Disease?

Fatty liver disease means extra fat has built up inside liver cells. The most common type is now called metabolic dysfunction-associated steatotic liver disease (MASLD), previously known as non-alcoholic fatty liver disease (NAFLD). It is linked to factors such as excess weight, type 2 diabetes, high blood pressure, and high cholesterol. Fatty liver can also be caused by alcohol use.

Many people with fatty liver have no symptoms. It is often found by chance during an ultrasound ordered for another reason, such as abnormal liver blood tests or abdominal pain.

What Does Fatty Liver Look Like on Ultrasound?

Fat changes how sound waves travel through the liver, which changes how the liver looks on the screen. Radiologists look for these signs:

A bright liver: The liver looks whiter (more echogenic) than normal.

Liver brighter than the kidney: A healthy liver is about as bright as the right kidney. With fatty liver, the liver is noticeably brighter.

Blurred vessel walls: The bright walls of the blood vessels inside the liver become harder to see.

Fading at the back of the liver: Sound waves weaken as they pass through fat, so the deeper part of the liver and the diaphragm can look dim or hazy.

Fatty sparing: Small areas with less fat, often near the gallbladder, can look darker than the rest of the liver. This is usually normal.

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To compare these signs with a healthy liver, see normal vs. abnormal liver ultrasound.

Fatty Liver Grades on Ultrasound: Grade 1, 2 and 3

Radiologists often grade fatty liver by how bright the liver is and how well they can see the structures inside and behind it.

Grade What the radiologist sees What it generally means
Grade 1 (mild) Liver is slightly brighter than normal. Blood vessels and the diaphragm are still clearly visible. Mild fat buildup
Grade 2 (moderate) Liver is moderately brighter. Vessel walls and the diaphragm are a little harder to see. Moderate fat buildup
Grade 3 (severe) Liver is much brighter. Vessel walls, the diaphragm, and the back of the liver are hard or impossible to see. Severe fat buildup

The grade describes how much fat is present. It does not show whether the liver is inflamed or scarred, which is why your provider may order other tests.

How Accurate Is Ultrasound for Fatty Liver?

Ultrasound is a reliable first test for fatty liver. Research reviews have found that it correctly detects most moderate and severe cases, roughly 8 to 9 out of 10. It is less reliable for mild fatty liver, especially when fat makes up less than about 20% of the liver.

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A few other factors can affect accuracy:

  • Body size: Extra tissue between the skin and the liver can make images harder to read.
  • Gas in the bowel: Gas can block part of the view, which is one reason fasting helps.
  • Scarring: Ultrasound alone cannot reliably measure early scarring (fibrosis).

When providers need more detail, they may order blood-based scores, elastography (a stiffness measurement), or MRI. Learn more in MRI vs. ultrasound.

Fatty Liver vs. Cirrhosis on Ultrasound

Fatty liver and cirrhosis can both appear on a liver ultrasound, but they look different.

Feature Fatty liver Cirrhosis
Brightness Brighter than normal Can be normal or bright
Surface Smooth Nodular or bumpy
Texture Even but bright Coarse and uneven
Size Normal or enlarged Often small, with some areas enlarged
Other signs Usually none Possible fluid in the belly or an enlarged spleen

For a closer look, read can a liver ultrasound detect cirrhosis.

What Happens After a Fatty Liver Finding?

Your provider will look at your ultrasound alongside your health history and lab results. Next steps often include:

  1. Liver blood tests to check for inflammation.
  2. Tests for related conditions such as diabetes, high cholesterol, and high blood pressure.
  3. A check for scarring using blood-based scores or elastography when needed.
  4. Lifestyle guidance, since fat in the liver often decreases with gradual weight loss, regular physical activity, and limiting alcohol.
  5. Follow-up imaging to track changes over time.

Talk with your provider before making major changes, especially if you have diabetes or take medications.

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Getting a Liver Ultrasound in Fairbanks, AK

Fairbanks Ultrasound is a locally owned imaging center at 570 Riverstone Way, Unit #2, in Fairbanks, Alaska. We perform liver ultrasounds and complete abdominal ultrasounds, and every exam is interpreted by a radiologist.

Call (907) 374-4644 or request an appointment. We are open Monday through Friday, 8:00 am to 5:00 pm.

Frequently Asked Questions

Fatty liver looks brighter than normal on ultrasound, usually brighter than the right kidney. In more advanced cases, the blood vessel walls and the diaphragm behind the liver become harder to see.

Grade 1 is mild, with a slightly bright liver and clearly visible vessels. Grade 2 is moderate, with vessels and the diaphragm a little harder to see. Grade 3 is severe, with those structures hard or impossible to see.

Grade 1 means a mild amount of fat in the liver. It is common and often improves with lifestyle changes, but your provider may still order tests to check for inflammation or scarring.

Yes. Ultrasound can miss mild fatty liver, especially when fat makes up less than about 20% of the liver. It is much more reliable for moderate and severe cases.

In many people, fat in the liver decreases with gradual weight loss, regular physical activity, limiting alcohol, and managing conditions like diabetes. Your provider can recommend a plan that fits your health.

Schedule your appendix ultrasound in Fairbanks, Alaska today. Call (907) 374-4644 or book online.

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