Ultrasound Characteristics of Alcoholic Steatosis

Primary Ultrasound Features

Alcoholic steatosis on ultrasound appears as increased liver echogenicity compared to the renal cortex, often with posterior beam attenuation, though ultrasound cannot distinguish alcoholic from non-alcoholic causes and has low sensitivity when steatosis is less than 30% 1, 2, 3

Ultrasound has significant limitations, including the inability to differentiate etiology, whether steatosis is alcoholic or non-alcoholic in origin 1, 2, 3, 4
Ultrasound has poor sensitivity for mild disease, requiring at least 20-30% hepatic fat content for detection, and steatosis below this threshold is frequently missed 1, 2, 3
Ultrasound cannot distinguish simple steatosis from steatohepatitis, and cannot identify inflammation or differentiate alcoholic steatohepatitis from simple fatty liver 1, 2
Ultrasound results depend heavily on operator experience and technique, and examination is difficult in obese patients 1, 2

Controlled Attenuation Parameter (CAP) via transient elastography provides quantitative assessment, with a normal CAP range of 156-287 dB/m 2, 5
Cutoff values for steatosis severity are 250 dB/m (mild), 299 dB/m (moderate), and 327 dB/m (severe) 2, 5
CAP can be performed simultaneously with liver stiffness measurement for fibrosis assessment 2, 5

Ultrasound serves as the first-line screening modality for suspected alcoholic liver disease due to its wide availability and robust performance for moderate-to-severe steatosis, according to the American Association for the Study of Liver Diseases 1, 2, 3, 5
Liver biopsy remains necessary for definitive diagnosis when aggressive treatment is considered, cofactors are suspected, or histologic confirmation of alcoholic steatohepatitis is required, as recommended by the American Association for the Study of Liver Diseases 3, 6, 7

Elevated liver stiffness measurements in patients with abnormal liver function tests may be falsely elevated due to inflammation rather than fibrosis, as noted by the European Association for the Study of the Liver 3