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Fig. 3 —Chart shows association between local tumor progression and presence of contiguous vessels and ablative margin of 5 mm within ablation zone in 85 patients with hepatocellular carcinoma (HCC). Number of cases of local tumor progression was high for HCCs with contiguous vessels that did not have ablative margin of 5 mm within ablation zone. Proportion of cases with ablative margin of 5 mm was significantly lower in HCCs with contiguous vessels than in those without contiguous vessels (p = 0.005, chi-square test). Ablative margin was not associated with local tumor progression in HCCs without contiguous vessels.