What are sonographic signs of intussusception?
The intussusceptum (i.e. the part that is pulled inside) contains hyperechoic mesentery which in ileocolic intussusception is commonly thicker than the intussuscipiens (i.e. the outer bowel loop containing the intussusceptum). In infants, the intussuscepted mesentery can usually be seen to contain lymph nodes. The above elicit the target (or doughnut) sign, the pseudokidney sign, and the crescent in a doughnut sign (see Intussusception aricle). Transient intussusception that is expected to reduce spontaneously usually appears as bowel within bowel without intervening mesentery.
Ileocolic intussusception in same location as previous.
Normal vascular flow demonstrated in wall of Intussuscepted bowel.