Final answer:
The radiologic examination that can demonstrate ureteral reflux is the Voiding cystourethrogram (VCUG). It involves the injection of a contrast dye into the bladder through a catheter, allowing the radiologist to observe the flow of urine and visualize any reflux of urine from the bladder into the ureter.
Step-by-step explanation:
Ureteral reflux refers to the backward flow of urine from the bladder into the ureter. The radiologic examination that can demonstrate ureteral reflux is the Voiding cystourethrogram (VCUG). A VCUG is a specialized X-ray examination that involves the injection of a contrast dye into the bladder through a catheter. The radiologist then observes the flow of contrast dye as the patient urinates, allowing them to visualize any reflux of urine from the bladder into the ureter.