Abdominal hernias are a common clinical problem. The main types of
abdominal hernias are external or
abdominal wall hernias, which involve protrusion of abdominal contents through a defect in the abdominal wall;
internal hernias, which involve protrusion of viscera through the peritoneum or mesentery and into a compartment in the abdominal cavity; and
diaphragmatic hernias, which involve protrusion of abdominal contents into the chest. Clinical diagnosis of
abdominal hernias can be difficult. However, plain radiography, radiography performed after administration of
barium, and computed tomography allow evaluation of suspected
abdominal hernias and detection of those that are clinically occult. The anatomic location of the
hernia, the contents, and complications such as incarceration, bowel obstruction,
volvulus, and strangulation can be demonstrated with radiologic examination. Occasionally, complications such as
neoplasms or inflammatory conditions can be identified in the hernial contents. With abdominal imaging modalities, a variety of
abdominal hernias can be confidently diagnosed.