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The urinary system—the kidneys, ureters, bladder
and urethra—filters waste from the body
and removes it in the form of urine. In
hydronephrosis, the outflow of urine is impaired, putting stress on this vital system.
Hydronephrosis isn’t a specific diagnosis. Instead, it’s a finding that shows that urine is overfilling the kidney.
A number of conditions can cause this backup of urine.