Hepatic epithelioid angiomyolipoma with prominent invasive growth pattern: a hitherto unreported histopathologic feature which might promote misdiagnosis

Background: Hepatic angiomyolipoma (AML) is a rare tumor which composes of variable admixtures of adipose tissue, spindle or epithelioid myoid cells and thickwalled blood vessels. Although an invasive growth pattern into the parenchyma at the tumor-non-tumor interface and/or along the vessels was reported to be found in hepatic AML, hepatic AML with prominent invasive growth pattern has not been reported.