Figure 7a.

US-2 subthreshold observation in a 60-year-old man with NASH cirrhosis. (a) Transverse gray-scale US image shows a 7-mm hypoechoic observation (arrows). (b–d) Subsequent T1-weighted fat-suppressed nonenhanced (b), arterial phase (c), and delayed phase (d) extracellular contrast-enhanced MR images show no corresponding findings. To decrease the false-positive rate at US screening, surveillance with 3–6-month follow-up US rather than multiphase contrast-enhanced CT, MRI, or US is recommended for observations measuring less than 1 cm.