Fig. 2

Hypervascular metastasis. A 63-year-old male undergoes follow-up CECT in the arterial phase 4 years after ablation of a renal cell carcinoma. This reveals a 26-mm hypervascular lesion in segment VII of the liver, which is histopathologically proven to be a metastasis of the RCC. RF ablation is performed. a Twenty-four hours after the ablation, a DECT is performed. The water map image shows a centrally located hyperdensity in the ablation zone (arrow), corresponding to intense charring and desiccation of the treated lesion. Note that this hyperdensity is less visible on the iodine maps. The arterial phase image does not demonstrate any focal hypervascularity at the border of the ablation zone. No rim enhancement can be seen. The delineation of the total ablation zone is better depicted on the portal-venous phase greyscale- and colour-coded iodine images, because the amount of iodine in the liver parenchyma is higher. b On the 1-year follow-up CECT, a smooth delineation of the ablation zone is noticed, which serves as proof of the technical success of the ablation. The central hyperdensity however is still noticeable (arrowheads)