Separate sac of peritoneum: a case of an unusual cause of intestinal obstruction.

Internal hernia is a rare condition. These hernias are classified in different categories, depending on the location of its orifice. It should be considered in cases of acute intestinal obstruction, particularly in the absence of an external hernia or in the absence of history of previous abdominal surgery. The authors report a unique case of obstruction of the small bowel, that was almost entirely wrapped in a separate peritoneal sac.