Additional file 1 of Predicting bowel necrosis in pediatric acute intussusception using roundness and other related factors

Supplementary material 1. Additional file1. Fig. 1 Intussusception. Male child, 14 months. a. The cross section of intussusception lesions showed a"concentric circle sign" (red arrow). b. The longitudinal section of intussusception lesions showed "false kidney sign" (red outline). Additional file 2. Fig. 2 Transverse view of intussusception. Male child, 14 months. Arrow A refers to the outer intestinal tract of intussusception (the part between the red circle and the yellow circle), arrow B refers to the inserted intestinal tract (the part inside the yellow circle), arrow C refers to the hyperechoic fat, arrow D refers to the hypoechoic lymph node; EF is the thickness of "concentric ring" and GH is the width of"concentric ring".