Figure 10b. Drawings illustrate selective retrograde obliteration with a mixture of NBCA and lipiodol. (a) EOI injected via a balloon catheter flows into the collateral veins that cannot be catheterized. Arrows indicate direction of flow through the collateral veins. (b) Two catheters are introduced into the shunt—one from each femoral vein. A microcatheter is advanced into the varices through one of the catheters. (c) The draining shunt is occluded with coils placed via the other catheter. (d) An NBCA-lipiodol mixture (1:3) is injected via the microcatheter until the entire variceal complex is opacified.