Introduction: The objective was to report a rare case of the surgical discovery of a perforated jejunal diverticulum.

Observation: A 68-year-old woman consulted for abdominal pain of 3 days duration accompanied by transit disorder. The abdominal pain was located on the left flank and was accompanied by vomiting. The patient had taken decoctions without favorable results. The persistence of the pain and vomiting motivated the consultation. Her general condition was impaired. The abdomen was distended and tender. The prehepatic dullness was preserved. Peristalsis was audible, and the hernial orifices were free. The X-ray showed hydro-aeric levels and aerocoly with pneumoperitoneum. The laparotomy documented a moderate amount of serohematic fluid accumulation and a perforated jejunal diverticulitis. A jejunal resection was performed removing the diverticulum and the postoperative course was good.

Conclusion: The perforation of the jejunal diverticulum is a rare and serious complication, often discovered during surgery and likely to compromise vital prognosis.