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Fig. 1.
A. Ultrasound of the abdomen in the axial plane showing a lesion (solid arrow) in the umbilical region with multiple concentric hyperechoic and hypoechoic rings – target sign or doughnut sign appearance (
B, C
). On tracing the lesion further, eccentric hyperechoic mesentery (solid arrow) appears
Fig. 2.
Diameter of the lesion – 28 mm (long solid arrow), outer wall diameter – 5.5 mm (dashed arrow) and mesenteric fat core – 4.6 mm (short solid arrow). The fat core-to-outer wall index is 0.84
Fig. 3.
Ultrasound image in the longitudinal plane showing the pseudokidney appearance of the lesion with the hyperechoic mesentery (solid arrow) located eccentrically to the central limb (dashed arrow) of the intussusceptum
Fig. 4.
Colour Doppler ultrasound image in the axial plane showing intact vascularity in the bowel wall within the intussusception