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Figure 1. Animal 4. Embolization of portal vein branches. The portal vein in this minipig was accessed by means of transhepatic puncture, and a catheter was advanced into the main portal vein. A, Digital subtraction portogram obtained before embolization was performed shows the portal vein branches (arrows) supplying the left lobe and the majority of the median lobe. These branches were then embolized with PVA particles and appropriately sized embolization coils. B, Portogram obtained after embolization shows occlusion of the portal vein branches.