Spoke-wheel sign of focal nodular hyperplasia revealed by superb micro-vascular ultrasound imaging

A 40-year-old man came to the hospital for follow-up of right hepatic tumor known for 3 years. His medical history is unremarkable. He received physical check-up 3 years ago and a 3.8 cm isoechoic hepatic tumor was found during the ultrasound examination. The previous abdominal computed tomography revealed a well-defined tumor with central scarring tumor in the right liver (Figure 1a). The tumor showed hyperdensity during heptic arterial phase...