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Fig. 1A —58-year-old man who underwent biopsy 4 days before transarterial chemoembolization. Arterial phase of celiac arteriography performed with digital subtraction angiography technique shows filling of portal vein branches (arrowheads) via arterioportal fistula. Because arterioportal fistula steals blood flow from tumor-feeding vessel, hepatocellular carcinoma is only faintly visualized (arrow).