Petersen\'s Hernia after Roux-en-Y Lateral Pancreatojejunostomy: A Case Report

Background: Petersen's hernia is a rare but serious complication following Roux-en-Y reconstruction, often presenting with nonspecific symptoms and the risk of bowel obstruction.Case presentation: A 26-year-old male with prior Roux-en-Y lateral pancreatojejunostomy presented with intermittent epigastric pain, nausea, and vomiting.CT imaging showed dilated bowel loops with a whirlpool sign.Emergency laparotomy confirmed small bowel volvulus due to herniation through a Petersen defect.Detorsion and defect closure were performed, with an uneventful recovery.Conclusion: This case highlights the diagnostic challenge of Petersen's hernia in patients with chronic calcific pancreatitis and emphasizes the importance of maintaining broad differential diagnoses in postoperative Roux-en-Y patients presenting with recurrent abdominal pain.