Congenital transmesenteric defect causing bowel strangulation in an adult.

Introduction: Congenital transmesenteric hernias represent a very small group of internal hernias which are uncommon and are a rare cause of intestinal obstruction. Diagnosis is frequently made at surgery. Reports of congenital transmesenteric hernia in the English literature usually involve the pediatric population; adult cases are rarer.
Case Report: A 22-year-old man who presented with a day's history of severe abdominal pain but without classic physical examination signs of abdominal obstruction was operated upon on account of increasing abdominal pain and distention associated with shock. Laparotomy revealed a congenital transmesenteric defect through which loops of bowel had herniated and become gangrenous, resulting in resection and end-to-end anastomosis.
Discussion: Congenital transmesenteric defects causing internal hernias in adults are rare. Preoperative diagnosis of the condition is difficult, in part, because there are no radiographic or laboratory findings to confirm the suspicion. Misdiagnosis resulting in delayed exploration may lead to small bowel necrosis and subsequent mortality.
Conclusion: A congenital internal hernia should be considered in a patient with bowel obstruction without previous abdominal surgery, inflammatory abdominal condition, or trauma. We wish to emphasize that, rather than trying to establish a correct diagnosis, the patient's clinical features should lead to early surgery in order to reduce morbidity and possible mortality.