Fig. 4.

Hepatic focal lesion before (a–c) and after RFA (d–g). a T2-WI shows a well-defined HFL of an intermediate signal. b Enhanced T1-WI in the arterial phase shows early arterial heterogeneous enhancement. c Enhanced T1-WI in the delayed phase shows washout with delayed capsule enhancement. d After treatment, T2-WI shows a low signal with peripheral hyperintensity. e DWI shows central areas of restriction. f Subtracted T1-WI arterial phase shows non-enhancement of the lesions with faint peripheral enhancement (arrow). g Delayed T1-WI shows persistent peripheral enhancement. Final diagnosis is LR-TR nonviable with post-therapy changes