Vesicoureteral Reflux (VUR) - urine flows back into one or both ureters
- In a normal system, once urine has drained into the bladder, it stays there until it is emptied during urination. Vesicoureteral reflux (VUR) occurs when urine flows back into the ureters and kidneys.
- In Grade I VUR the urine flows back into one or both of the ureters but does not reach the kidney
- In Grade II VUR urine flows back up to the kidney, but does not cause dilation of the renal pelvis
- In Grade III VUR there is mild to moderate dilation of the ureter and the renal pelvis
- In Grade IV VUR, the ureter, the renal pelvis and calyces are dilated
- In Grade V VUR there is severe dilation of the ureters, renal pelvis and calyces