"Fetal Pelviectasis"

Tuesday we had our anatomy scan on our son (also the day we found out it's a boy 😊) and the dr said that he has pelviectasis, some fluid build up in one of his kidneys. He also said its not uncommon and usually resolves itself. I have to go back in 8 weeks to the high risk clinic so they can look again and if it hasn't gone down they're going to monitor me until it does go down or for the rest of my pregnancy. 
I was wondering if anyone else had this and if so, what happened? Did it fix itself? Or if it didn't, did the dr move you to high risk status (if you weren't already high risk?)