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Among the advantages of the One Anastomosis Gastric Bypass (OAGB) are the lack of jejuno-jejunal anastomosis and a supposed lower incidence of internal hernia (IH), with only a few cases reported until now. However, the incidence of IH after OAGB is not null. We present a video of the laparoscopic management of an IH that occurred after an OAGB. The patient was a 49-year-old female who had undergone a laparoscopic revisional OAGB 2 years previously after a failed laparoscopic adjustable gastric banding. She was referred to our Unit for recurrent postprandial colicky pain. She lost a total of 50 kg and her body mass index (BMI) dropped from 38 to 19 kg/m 2 . A CT scan with intravenous contrast showed a swirl of the mesentery around the superior mesenteric artery, without small bowel obstruction. A laparoscopic exploration was performed, confirming the suspicion of IH at the Petersen's space. An anticlockwise derotation of the whole common limb was performed, and the Petersen's space was eventually closed with a running non-absorbable suture.

Introduction: Internal hernia (IH) represents the most common cause of small-bowel obstruction after laparoscopic RYGBP. The anatomic changes resulting from RYGBP, the use of laparoscopy, and the postoperative weight loss all account for the high incidence of IH after this procedure. As the symptoms may be very vague, the interpretation of the clinical picture may result difficult. Moreover, laparoscopic treatment of IH could be very challenging for surgeons not familiar with the modified intestinal anatomy of the RYGBP., Methods: The video shows the management of an IH at the Petersen's defect. A 51-year-old female was assessed for recurrent abdominal pain 3 years after a RYGBP. A CT scan showed the mesenteric swirl sign, so a diagnostic laparoscopy was performed. The video first shows the identification of the herniated bowel through the mesenteric defect. Then, complete reduction of the IH and the closure of the Petersen's defect are shown., Results: The total operative time was 35 min. The postoperative stay was uneventful and the patient was discharged in postoperative day one., Conclusion: In case of clinical suspicion of IH, even in case of normal laboratory and radiological findings, a surgical exploration is indicated.

The mini-gastric bypass (MGBP) is becoming an increasingly popular procedure worldwide. It is based on an "omega" reconstruction, resulting in a single anastomosis and in potential shortening of operative time. Internal hernia represents a potentially life-threatening complication after laparoscopic Roux-en-Y gastric bypass, but it has not yet been reported after a mini-gastric bypass. We herein describe, for the first time, a case of internal hernia after this surgery., (Copyright © 2016 Elsevier Masson SAS. All rights reserved.)

Background: Internal hernia (IH) is a well known complication of Roux-en-Y gastric bypass (RYGBP) which is more frequently encountered when the RYGBP is done laparoscopically., Methods: Patients with IH were identified from a prospective data-base of morbidly obese patients undergoing bariatric surgery at our center., Results: 10 patients with IH were identified out of 625 patients undergoing LRYGBP from 1998 to 2006 (incidence 1.6 %). The defects were closed in the last 155 cases with non-absorbable running sutures. There were 8 women and 2 men with mean age 38 years (range 28-54). The mean interval of time elapsed between LRYGBP and clinical presentation of IH was 26.5 months (range 7 days - 72 months). Abdominal pain, nausea and vomiting were the most common complaints. White blood cell count was increased to a mean of 64 mg/dl (range 45-155 mg/dl) in 6 patients. CT scan showed signs of intestinal obstruction in all 7 patients with acute presentation. Surgery was done by laparoscopy in 5 cases (2 in the setting of emergency), and by laparotomy in the remaining 5 cases. All IHs were located at the mesenteric defect and were treated with IH reduction in all but one patient who underwent small bowel resection. There was no mortality, and one patient had pneumonia with acute respiratory distress syndrome that resolved favorably., Conclusions: IH after LRYGBP occurred mainly at the mesenteric defect and in patients with no closure of the defect. The antecolic approach for the Roux-limb, the division of the greater omentum only when too thick, and the systematic closure of the defects with tight non-absorbable running sutures are recommended.