Internal Hernia After Laparoscopic One-Anastomosis (Mini) Gastric Bypass: Video Case Series of a Single-Center Experience.

Internal hernia (IH) after one-anastomosis gastric bypass (OAGB) was thought to have an extremely low incidence. In this video, we report three cases of post-OAGB symptomatic internal herniation. The first case is a 45-year-old female who presented 4 months after her OAGB with crampy abdominal pain and reflux symptoms. An exploratory laparoscopy showed Petersen's hernia; the hernia was reduced with no ischemia and the defect was closed. The second case is a 40-year-old male who presented 7 months after his surgery with abdominal pain and reflux. An exploratory laparoscopy showed Petersen's hernia; bowel was reduced and defect was closed through a laparotomy. The third case is a 64-year-old male who presented with refractory biliary reflux after OAGB. An elective diagnostic laparoscopy showed Petersen's hernia; the hernia was reduced and defect was closed. All patients recovered well with no recurrence of symptoms on follow-up. Internal hernia after OAGB is more common than the reported incidence. The threshold for diagnostic laparoscopy should be lowered for a OAGB patient with symptoms suggestive of IH.