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Fig. 12C —32-year-old man with multiple small liver nodules without
changes in 4 years. On color Doppler sonography, regenerative nodules can be
isoechoic or mildly hyperechoic with hypoechoic halo. Poor border definition
is also frequent finding. Most nodules show arterial vascularization (radial
and peripheral) at pulsed Doppler interrogation. MR T1-weighted image after
gadolinium injection shows multiple peripheral enhancing nodules
(arrows). On MRI, benign regenerative nodules are hyperintense on
T1-weighted and commonly hyperintense on T2-weighted images (distinctive
finding). There is hypervascularity at dynamic MR study.
