Arterial phase of a contrast-enhanced MRI prior to and following selective internal radiation therapy (SIRT)

(A) Arterial phase MRI after gadolinium contrast showing enhancing lesion in right lobe of liver (arrow), consistent with hepatocellular carcinoma.
(B) Follow-up MRI after SIRT at the same level showing no evidence of enhancement of the lesion (arrow) with associated area of heterogeneous enhancement posteriorly (arrowheads) consistent enhancing fibrosis in the treated zone. This area of fibrosis will retract and atrophy over time.