Marginal ulcer perforation after one anastomosis gastric bypass: a case report.

One anastomosis gastric bypass (OAGB) has gained popularity and it is currently the third most frequently performed bariatric procedure worldwide. A marginal ulcer (MU) at the anastomosis site between the gastric pouch and the small intestine is a common complication of gastric bypass procedures but a rare complication of OAGB. Risk factors for MUs include cigarette smoking, alcohol misuse, and Helicobacter pylori infection. MU symptoms include abdominal pain, nausea, and vomiting; however, some patients are asymptomatic. MU perforations are repaired as follows: laparoscopy with or without ulcer debridement, omental patch closure, conversion into Y gastric bypass, or reoperation. This report describes MU perforations in two patients after OAGB.