[Congenital transmesenteric hernia].
INTRODUCTION: Acute intestinal obstruction due to congenital defects in the mesentery of the small bowel are quite uncommon. The most frequent location of the defect is the mesentery of the terminal ileum. MATERIAL AND METHODS: Five cases of small bowel obstruction caused by congenital transmesenteric hernia was reviewed. RESULTS: Four were male and all patients had an intestinal obstructive disease, small bowel gangrene and peritonitis. Two patients died. DISCUSSION AND CONCLUSIONS: Diagnosis is difficult and most cases recorded until today are incidental findings on laparotomy and surgical treatment is mandatory.