Exactly as described, A functional stenosis is caused by gastric tube twisting. Patients who underwent laparoscopic sleeve gastrectomy and who were subsequently diagnosed with gastric twisting. Both cases required conversion to laparoscopic gastric bypass. Accompanying symptoms may vary but they commonly include early satiety, epigastric pain associated with food intake, gastroesophageal reflux and early vomiting. Although diagnose is mainly clinical, it requires high suspicion since endoscopy and gastrointestinal studies are not conclusive. The principal therapeutic options are endoscopic dilatations, serotomy and conversion to gastric bypass.