Mild prominence of both renal collecting systems

[Danisheba]

What does "Mild prominence of both renal collecting systems" mean and what is the treatment? It was find on my CT scan. All else was good.  It exactly said "Mild prominence of both renal collecting systems noted, a finding of uncertain significance."  
       Kidney levels would fine on annually blood work last week.  I have been having an ache on my lower left side that comes and goes and to be on the safe side, my GP sent me to GI and while she did not think that it is anything besides maybe the start of diverticulitis, she sent me for a CT scan to be on safe side.  I really think it is because I had my gallbladder taken out two years ago as I never had any aches or light pain before that.  Thank you so much!