Fig. 3

ICC (white thick arrow) without MVI in a 65-year-old woman (tumor grade, G2; CA19–9, ≥37 U/ml). Intrahepatic duct dilatation and visible hepatic artery penetration did not appear in all images of this lesion. a Axial T1-weighted image showing a tumor located in segment IV of the liver. The tumor morphology was spherical. b Axial T2-weighted-FS image showing that the signal of tumor edge was high intensity while that of the tumor center was low intensity. c Axial DW image (b = 500 s/mm²) showing a higher signal with a target sign. d Axial arterial phase image showing that the tumor exhibited edged enhancement (ring high signal). The maximum diameter of the tumor was 4.69 cm and the maximum enhancement edge thickness was 1.90 cm (black double arrows); the arterial edge enhancement ratio was 40.51% (1.90/4.69). e Axial portal vein phase showing the range of strengthening increased and began to fill the center of the lesion. f Coronal portal venous phase showing retraction of the hepatic capsule adjacent to the tumor (white thin arrow). g Axial delayed phase image showing that the signal of the tumor was high and the enhancement ratio of the lesion was approximately 4/4 (3/4 ≤ R ≤ 4/4)