From the case: Ileocolic intussusception
Rounded filling defect with meniscus of contrast at the hepatic flexure. This progressively reduced to the ileocecal valve with contrast filling the appendix. However, there initially remained a small amount of fullness at the ileocecal valve without reflux of contrast into the ileum. Eventually, there was reflux of contrast into the ileum with reduction of the small residual fillng defect at the ileocecal valve.