Abstract
A 36-year-old male with no history of laparotomy and abdominal trauma was admitted to our hospital complaining of having abdominal pain and vomiting. The CT scan showed dilation of the small intestine and ascites, and an internal hernia was suspected. An emergency laparotomy was performed. Intraoperatively, about 10cm of the ileum was found to have penetrated through the greater and lesser omentum. The ileum was not strangulated or necrotized, therefore, intestinal resection was not performed. Internal hernias through the greater and lesser omentum are difficult to diagnose preoperatively. Therefore, in the case of ileus with no history of laparotomy, an internal hernia through the greater and lesser omentum should be considered and an early operation should be performed.