Figure 1: Roux-en-Y gastric bypass surgery. The orientation of the gastrojejunal anastomosis may be retrocolic or antecolic. In our experience, a retrocolic approach is more common after an open surgical procedure, while an antecolic approach is more common after a laparoscopic approach to surgery. The bypassed stomach and the loop of small intestine (termed the biliopancreatic limb) distal to the pylorus but proximal to the jejunojejunal anastomosis may function as a blind pouch.