Fig. 3
From: Advances in liver US, CT, and MRI: moving toward the future
Contrast-enhanced ultrasound for assessment of focal nodular hyperplasia. Dual-display images with brightness-mode (left) and contrast-enhanced ultrasound images (right). a Images in arterial phase (28 s after the i.v. injection of contrast agent) show homogeneous and strong enhancement (white arrows) with a central hypoechoic scar (black arrow). b In the portal venous phase (86 s after the injection), the lesion is still slightly hyperechoic to the adjacent liver parenchyma (white arrows) and the central scar remains hypoechoic (black arrow)