INTRODUCTION: Left paraduodenal hernia is an internal herniation that develops due to anomalous fetal development. If incarcerated, it becomes an unusual cause of acute abdomen. CASE REPORT: This case report presents an uncommon case of a 39-year-old man with acute abdominal pain with vomiting. The patients medical history included recurrent subileous events and Crohn´s disease in long-term remission. CT scan of abdominal cavity indicated a possible mechanical obstruction of small bowel loops in the upper left abdominal quadrant. Incarcerated left paraduodenal herniation was identified during surgery. Repositioned small bowel loops did not require resection and the entrance of Landzert´s fossa was sutured. CONCLUSION: Left paraduodenal hernia is the most common congenital internal herniation. Although rare, it should be considered in the differential diagnosis of acute abdomen.

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