Figure 3
From: Ultrasonography (US) in the assessment of pediatric non traumatic gastrointestinal emergencies
Ultrasound features of intussusceptions. On the longitudinal scan obtained at the centre of the mass show the sandwich sign formed by three parallel hypo-echoic bands separated by two nearly parallel hyper-echoic bands. The outer hypo-echoic band represent the edematous everted limb of the intussuscepted and the thin intussusceptions, the central hypo-echoic band is the central limb of the intussuscepted. The hyper-echoic bands are caused by the mesentery that is dragged along with the bowel loop. Us scan obtained at the apex show the hair-fork-sign form by three parallel hypo- echoic bands (the prongs of the hair fork), separated by two hyper-echoic bands formed by mesentery. (a) Us scan obtained at the base shows the central limb of the intussusceptions eccentrically surround by the hyper-echoic mesentery that show the crescent in doughnut sign. (b)