![]() ![]() In this subset of patients, internal hernias account for just over half of all cases of small-bowel obstruction, almost equal to those caused by adhesions in one study. Over the past decade, their incidence has been increasing because of the more frequent performance of liver transplantations and gastric bypass surgery for bariatric treatment. Keywords: colon, CT, gastrointestinal radiology, hernia, small bowelĪlthough internal hernias have an overall incidence of less than 1%, they constitute up to 5.8% of all small-bowel obstructions, which, if left untreated, have been reported to have an overall mortality exceeding 50% if strangulation is present. ![]() This article illustrates the imaging findings of internal hernias, with emphasis placed on the CT findings, especially in transmesenteric, transmesocolic, and retroanastomotic types of internal hernias. It is important for radiologists to be familiar with and to understand the various types of internal hernias and their imaging features so that prompt and accurate diagnosis of these conditions can be made.ĬONCLUSION. A significant increase in hernias is occurring in patients undergoing transmesenteric, transmesocolic, and retroanastomotic surgical procedures. To complicate matters, the incidence of internal hernias is increasing because of a number of relatively new surgical procedures now being performed, including liver transplantation and gastric bypass surgery. Internal hernias, including paraduodenal (traditionally the most common), pericecal, foramen of Winslow, and intersigmoid hernias, account for approximately 0.5-5.8% of all cases of intestinal obstruction and are associated with a high mortality rate, exceeding 50% in some series. ![]()
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