Laparoscopic Roux-en-Y gastric bypass can be performed safely in patients with peritoneal encapsulation and/or malrotation of the small bowel, provided the surgeon understands these embryological anomalies and is experienced performing the procedure.

Obesity is increasing at an alarming rate in the developed world, reaching epidemic proportions. In Europe one fifth of the population is obese. Surgery has become the therapy of choice for morbid obesity, and laparoscopic Roux-en-Y gastric bypass (LRYGB) is one of the most commonly performed procedures. Several studies have shown a significant weight loss in patients treated surgically, with a long-term maintenance of the weight loss and improvement in many of the obesity-related medical illnesses