An Unusual Cause of Small Bowel Obstruction in a Young Adult: A Case Report of a Patent Omphalomesenteric Duct.

The omphalomesenteric duct is an embryologic structure that typically obliterates during early fetal development. Its persistence into adulthood is rare and may present with atypical clinical scenarios. We report a case of a 26-year-old male who presented with right lower quadrant abdominal pain initially suggestive of acute appendicitis. Intraoperative findings revealed a patent omphalomesenteric duct causing small bowel obstruction. The duct was resected, and a prophylactic appendectomy was performed. The patient recovered uneventfully and was discharged on postoperative day three without complications. Diagnosing the cause of intestinal obstruction in patients with no prior surgical history can be particularly challenging. Early recognition and timely surgical intervention in cases involving rare anomalies, such as a patent vitellointestinal duct, are critical. Surgeons should maintain a high index of suspicion for congenital causes in young adults presenting with bowel obstruction, as prompt management can significantly improve outcomes.