Gastrointestinal contrast radiograph. All patients were taken the gastrointestinal ioversol contrast radiograph on the third morning after LRYGB. The radiograph shows a typical appearance of the gastric pouch (length 5-6 cm, width 2-2.5 cm, volume 20-30 mL). LRYGB: Laparoscopic Roux-en-Y gastric bypass.