Post-treatment malignant liver lesions: MR imaging☆

MR imaging has a fundamental role in the evaluation of hepatic malignant tumors. Specific features seen on MR images after therapy of these lesions may help to evaluate therapy success and early detection of disease recurrence. The purpose of this article is to describe the MR imaging appearance of malignant hepatic lesions following treatment. This includes surgical resection, systemic chemotherapy, chemoembolization, ablation therapies (percutaneous ethanol injection, radio frequency, cryoablation, microwave and interstitial laser) and liver transplantation. In order to improve the understanding of MR imaging features of these treatment methods, a brief review of the techniques, mechanisms of action, and indications are described.