Stage 5 ckd due to Upj in left kidney. Told right is toast. Possible crossing vessels. Stent placed, next test at 33 percent, since had many tests, renal scan , ct , etc. so single kidney in trouble. Urologist says my kidney will not improve. All tests results will be at his office when I meet with him next week. Should I be worried about the life of this remaining kidney. Not sure of secondary disease yet. Not sure why right kidney failed completely. Been stable creatinine for 18 years, with some structural changes. So confusing