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Abstract
Dyanmic MRI with its new subtraction technique is a powerful tool in detection of tumour viability after Radiofrequency ablation of hepatocellular carcinoma. We found that dynamic study is the gold standard in detection of viable residual lesions. Well defined nodular enhancement, thick irregular marginal enhancement or gross enlargement of the lesion with arterial phase enhancement and contrast wash out were considered positive for malignancy. We also found that subtraction technique is very helpful in differentiation between the viable residule /recurrent malignant lesions and the post treatment coagulative necrosis with significant statistical differences between the conventional dynamic MR and when we add the subtraction technique