What Causes Enlarged Kidneys And Ureters?

Hi, I m an urostomy patient of 18 months now and was diagnose with Inter Stitial Cystitus. Over a 20 year period my bladder became so deceased I couldn t even void without pain. My urologist did all that was possible and then some but no relief. My bladder ended up with cracks and ulcers. Found a wonderful surgeon who agreed to remove my bladder and my life has just turned completely around. Recently I passed a kidney stone with a small loop of wire in it. So surprised to find something of its size and didn t even feel any pain. My Medical Dr. did the urinalysis and ultra sound, found some infection, of which antibiotics were taken, but the ultra sound showed my kidneys and ureters were enlarged. Is there any chance this could be caused by having a full appliance (bag) occasionally or something else? I have a friend who has had this same surgery 25 yrs ago and she has this same problem, lrg kidney and ureters.