Figure 4.The DS variant of BPD with a sleeve gastrectomy, retention of the gastric antrum, diversion of food into the mid small gut and diversion of pancreatic and biliary secretions to the distal small gut .Note both limbs are passing behind the transverse colon and a colour difference is added to help follow the respective pathways. The common channel is the normal ileum terminating at the ileo-caecal junction.