Figure 7c. FNH discovered incidentally in a 29-year-old woman with a history of oral contraception. (a) Baseline US image shows a slightly hypoechoic lesion (arrows). (b) Very early arterial phase US image obtained 15 seconds after contrast material injection demonstrates rapid lesion enhancement (arrows) with discrete intralesional and perilesional arteries. (c) Later arterial phase US image obtained 29 seconds after injection demonstrates marked homogeneous lesion enhancement (arrows). (d) Portal phase US image obtained 49 seconds after injection demonstrates lesion isoechogenicity (arrows). (e) Arterial phase CT scan show a homogeneously hyperattenuating lesion (arrow) (cf c).