Fig. 2. Gastric bypasses, with tiny proximal gastric pouch restricting intake and jejunal loop providing some malabsorption. A. Loop gastric bypass of Mason. B. Roux-en-Y configuration, with stomach partitioned by staple-lines. C. Roux-en-Y configuration, with divided stomach. D. Distal Roux-en-Y gastric bypass: stapled gastric pouch with Roux-limb anastomosed to the lesser curvature (Torres [29]); the shaded area represents Roux (alimentary) limb and common (major digestive) limb.