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Internal hernia

Internal hernias are protrusions of the viscera through the peritoneum or mesentery but remaining within 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 include:

Radiographic features

CT

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

See also

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