Focal nodular hyperplasia of the liver on ultrasound and MRI

Greyscale ultrasound image in a patient with focal nodular hyperplasia shows slightly hyperechoic liver lesion (A, arrow). The color Doppler image shows "spoke-wheel" pattern of branching vessels (B, arrowhead).

T2-weighted MRI demonstrates focal nodular hyperplasia with mild hyperintensity compared with surrounding liver. The central scar is hyperintense (C, dashed arrow); T1-weighted precontrast image shows lesion is isointense to surrounding parenchyma and the scar is hypointense (D, thick arrow).