Figure 6b. (a) Drawing illustrates type 2 gastric varices from gastric veins with different pressures. (b) Drawing illustrates the standard BRTO method in this situation. EOI injected via a balloon catheter into the draining vein tends to flow into a low-pressure gastric vein (red arrows), thereby increasing the risk of inflow into the portal vein (PV) (black arrow) or of insufficient obliteration of the varices.