Obstructed: Hydronephrosis of one or both kidneys means there is blockage or obstruction preventing the urine from flowing normally from the kidney to the bladder, and then out the urethra. There are many causes such as stones, tumors, scarring, etc. If blockage occurs below the bladder i.E an enlarged prostate in a male, both kidneys will be involved. If severe and chronic, can result in kidney failure.
Answered 9/30/2017
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