Figure 4a. Ethanol ablation of hepatocellular carcinoma. (a) Initial conventional helical image demonstrates tumor recurrence (arrow) following surgical resection. (b) During table movement and ethanol injection, sequential low-dose (50-mA) CT fluoroscopic images (1–6) demonstrate distribution of ethanol within the lesion (arrows). Most of the low-attenuation ethanol has been retained within the pseudocapsule of the tumor. Three needles have been inserted into the lesion. (c) CT scan 4 months later demonstrates shrinkage and absence of enhancement in the lesion (arrow), indicating successful treatment.