Redo Surgery: Transformation of a Bariatric Treatment in Another An estimated 2% of men and 6% of women in the USA are morbidly obese. These patients have a mortality rate that is 6 to 12 times higher than that of their normal-weight peers. In these extreme cases of overweight, only surgical intervention can produce substantial and sustained weight loss. However, up to 20% of these patients will require re-operation for failure to achieve or maintain an adequate weight loss. Re-operative bariatric surgery can be challenging and has traditionally been performed as an open procedure. We present 29 patients who underwent a laparoscopic Roux-en-Y gastric bypass or a biliopancreatic diversion with duodenal switch after failure to achieve weight loss with prior laparoscopic or open restrictive procedures. Their average body mass index before surgical revision was 46.2 kg/m². Mean operative time was 3 h 20 min, and length of hospital stay was 6.1 days. There were 3 complications in 2 patients and no deaths. Our initial experience suggests that laparoscopic gastric bypass is a safe and feasible re-operative bariatric procedure. For confirmation, a larger series of patients with follow-up data must be awaited.