Hepatic lipomas are rare, usually asymptomatic, benign lesions 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 myelolipoma 5.
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
- T2: high signal
- fat-suppressed sequences: shows fat suppression
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