It is a description of what is seen, and is meaningless as regards function. Vesicoureteral reflux is a common occurrence. The urine is able to flow back up toward the kidney. Authors say that reflux itself is not a problem but coupled with bacteria spells trouble. Grade three has about a fifty -fifty chance of resolving by the age of five.
Treatment includes antibiotics to prevent infections while the young kidney is susceptible.
It is important that these not be discontinued until your urologist advises you to do so. If the reflux fails to resolve on its own, then surgery can be performed to correct the problem. There is some debate about the timing and place for such surgery. There is a significant chance that siblings of refluxing children as well as their mothers have or had reflux. Certainly siblings need to be evaluated in this regard.