- Protrusion of the viscera through the peritoneum or mesentery and into a compartment in the abdominal cavity.
- Most common presentation is an acute intestinal obstruction of small bowel loops that develops through normal or abnormal apertures.
- Responsible hernial orifices are usually preexisting anatomic structures, such as foramina, recesses, and fossae.
- Pathologic defects of the mesentery and visceral peritoneum, which are caused by congenital mechanisms, surgery, trauma, inflammation, and circulation, are also potential herniation orifices.
 Types of internal hernias
- Foramen of Winslow
- Sigmoid mesocolon
- Pelvic hernias
 Imaging Findings
- Encapsulation of distended bowel loops with an abnormal location, arrangement or crowding of small-bowel loops within the hernial sac, evidence of obstruction with segmental dilatation and stasis.
- Mesenteric vessel abnormalities, with engorgement, crowding, twisting, and stretching of these vessels
Patient #1: Presents with intermittent abdominal pain. History of gastric bypass
 See Also
 External Links
- Martin, Lucie C., Merkle, Elmar M., Thompson, William M. Review of Internal Hernias: Radiographic and Clinical Findings. Am. J. Roentgenol. 2006 186: 703-717.
- Nobuyuki Takeyama, Takehiko Gokan, Yoshimitsu Ohgiya, Shuichi Satoh, Takashi Hashizume, Kiyoshi Hataya, Hiroshi Kushiro, Makoto Nakanishi, Mitsuo Kusano, and Hirotsugu Munechika. CT of Internal Hernias. RadioGraphics 2005 25: 997-1015.