 Balloon-occluded retrograde transvenous venography. When the gastrorenal shunt is balloon-occluded (arrow) and retrogradely imaged, the posterior gastric vein, which is the inflow vessel, is visualized via the gastric varices. A part of the left inferior phrenic vein as an outflow vessel is also demonstrated. PGV: Posterior gastric vein; GV: Gastric varices; LIPV: Left inferior phrenic vein.