Figure 6c. BRTO technique for type B-1 gastric varices. (a) Drawing illustrates gastric varices treated with BRTO. Small collateral veins are occluded with stepwise injection of EOI. (b) Balloon-occluded venogram shows the small collateral veins (arrows). (c) Fluoroscopic image obtained during BRTO performed after obliteration of the small collateral veins with stepwise injection of EOI shows sufficient variceal filling.