This document discusses radiological imaging techniques for diagnosing and evaluating intussusception. It provides examples of how intussusception appears on plain abdominal x-rays, ultrasound scans, barium enemas, and CT scans. On CT scans, intussusception has a pathognomonic sausage-like or target-like appearance, with visible mesenteric fat and vessels. CT scanning is reported to have the highest diagnostic accuracy of 58-100% for intussusception. However, imaging cannot determine the underlying cause or extent of ischemic injury requiring surgery. The document shows various examples of intussusceptions appearing on CT scans in different regions of the bowel.

1. Radiological imaging of intussusception.
Dr/ ABD ALLAH NAZEER. MD.

11. Intussusception on plain abdominal x-ray showing the target sign.
(B) Plain erect abdominal radiograph of a 6-month-old child with intussusception,
showing multiple air-fluid levels consistent with intestinal obstruction.

15. Ultrasound scan showing the doughnut appearance (target lesion)
of an intussusception

16. Longitudinal ultrasound of an intussusception—the pseudokidney sign.

19. Air reduction of an ileocolic intussusception. (B) Barium enema
showing intussusceptum in the distal ascending colon.

21. Meniscus and coiled spring sign of intussusception.

22. Ilio-colic intussusception.

23. Meniscus sign of intussusception at the hepatic flexure on barium enema.

25. CT is the most effective and accurate diagnostic technique.
Intussusception can be confidently diagnosed on CT because of its
virtually pathognomonic appearance. It appears as a complex soft
tissue mass (sausage-like or target-like appearance), consisting of
the outer intussuscipiens and the central intussusceptum. There is
often an eccentric area of fat density within the mass representing
the intussuscepted mesenteric fat, and the mesenteric vessels are
often visible within it.
Recently, with the signs of target or sausage, mesenteric fat and
vessels, abdominal CT scan has been reported to be the most useful
imaging technique, with a diagnostic accuracy is 58%-100%.
However, imaging modalities are limited in determining the
primary cause of intussusception as well as in determining the
presence or absence of ischemic injury at the involved bowel
segment, which requires immediate surgery.
CT Appearance.

27. Ileocolic Intussusception from an
adenocarcinoma causing bowel edema..

28. ileocolic intussusception caused by mesenteric lymphadenitis.

29. (jejunojejunal) intussusception (arrows).

30. jejunojejunal intussusception (arrows).

31. jejunojejunal intussusception (arrows)

32. jejunoduodenal intussusception (arrows).

33. colocolic intussusception.

34. enteroenteric intussusceptions (arrows).

35. Ileocolic intussusception

36. Colocolic intussusception caused by a lipoma.

37. Colocolic intussusception secondary to adenocarcinoma

38. ileocolic intussusception caused by mesenteric lymphadenitis.

39. Ileoileal intussusceptions.

40. Thank You.