Intestinal obstruction caused by internal hernia is a rare condition. A 14-year-old girl who suffered from acute abdominal pain two days after appendectomy is presented. Abdominal sonography and plain abdominal x-ray showed dilated small bowel loops and air-fluid levels indicating mechanical intestinal obstruction. Exploratory laparotomy revealed small intestine loops herniated through the lesser omentum. The anatomical aspects are reviewed and discussed.
