The “peripheral washout sign” in focal hepatic lesions: not always an MRI sign of malignancy

The “peripheral washout sign” is a magnetic resonance imaging finding defined as an enhancing liver lesion with a peripheral rim of de-enhancement relative to its center and surrounding parenchyma on delayed contrast-enhanced images. The “peripheral washout sign” has been described solely in malignant liver lesions. We present a histologically proven benign hepatic angiomyolipoma showing the “peripheral washout sign”. To the best of our knowledge, this is the first report on a benign hepatic lesion exhibiting this extremely specific imaging feature.