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Fig. 2D. 2-year-old girl with ileocolic intussusception due to enteric
duplication cyst of ileocecal junction. Sonogram of right lower quadrant
obtained after air enema confirms reduction of intussusception. Bilobed
duplication cyst persists as fluid-filled structure with well-defined wall,
which in part shows so-called gut signature (inner hyperechoic layer and outer
hypoechoic rim).