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Fig. 2A. —5-month-old boy with biliary atresia. CO₂ splenoportogram shows splenic superior mesenteric vein (thick solid arrows), coronary and gastroesophageal varices (thin solid arrow), and patent diminutive portal veins (open arrow), which were incorrectly interpreted as collateral vein. CO₂ injection was performed with patient in Trendelenburg's position.