A hepatic lipoma is a rare, usually asymptomatic, benign lesion of the liver.
They may be composed purely of fat cells, or they may be mixed with adenomatous, angiomatous or myomatous tissue, resulting in lesions such as adenolipoma, angiomyolipoma or myelolipoma5.
Mostly found as isolated entities 6 and range from 1 to 6 cm in diameter.
Typically, a lipoma is seen as a well defined, solid hyperechoic intrahepatic mass lesion with variable distal acoustic shadow.
Focal displacement and discontinuity of the diaphragm deep to the lipoma may be seen due to slower sound speed in fat tissue compared to normal liver tissue and refraction of sound beam 7.
Hepatic lipoma is a rounded lesion with attenuation corresponding to fat (-20 to -70 HU). No soft tissue component or enhancement is visible in a pure hepatic lipoma.
Rounded lesion with typical fat signal characteristics:
- T1: high signal
- fat suppressed sequences: shows fat suppression
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