Rare benign liver tumors which contain fat, include lipoma, angiomyolipoma, myelolipoma, and angiomyelolipo-ma. The imaging diagnosis of these uncommon benign tumors is based on the identification of fat within the mass , although caution is advised, since hepatic adenoma and hepatocellular carcinoma can also contain fat. More commonly, focal fatty infiltration, while not a neoplasm, can simulate a mass lesion, and this can be categorized by in- and out-of-phase T1 MR imaging. Small biliary hamartomas can be seen in the liver, and can appear cystic. These are usually less than 5 mm in diameter, but occasionally can simulate small neoplasms.
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