Fig. 5
From: MRI assessment of hepatocellular carcinoma after locoregional therapy
Hepatic focal lesion after RFA. a T2-WI shows a well-defined treated subcapsular focal lesion (white arrow). Two other smaller lesions are seen posteriorly; one is of an intermediate signal (red arrow) and the other is of a high signal (green arrow). b Inverse of DWI shows no restriction of the treated lesion (white arrow), yet shows restriction of the other two lesions. ADC (not shown) shows T2 shine through of the posterior lesion (green arrow) with true restriction of the anterior lesion (red arrow). c Enhanced T1-WI in the arterial phase shows a high signal of the treated lesion that can be misinterpreted as an arterial hyperenhancing focal lesion. Note the enhancement of the anterior lesion and non-enhancement of the posterior small lesions. d Subtracted image shows no appreciable enhancement of the treated lesion and posterior lesion, yet shows definite enhancement of the red-arrowed lesion. e Delayed T1-WI shows washout of the red-arrowed lesion. Final diagnosis is LR-TR nonviable, new small HCC, and small hepatic cyst