An asymptomatic 45-year-old man presented with a minimal hepatic dysfunction. (a and b) Enhanced CT shows a portal vein (PV) straddling the duodenum (D) and pancreas (P) and running adjacent to the gallbladder (G). The point of confluence with the splenic vein and superior mesenteric vein was far more caudal than usual. Associated anomalies were the interruption of the inferior vena cava with hemizygos continuation (arrows), midgut malrotation, and agenesis of the caudate lobe of the liver.
CT Abdomen Preduodenal portal