The prognosis of<unk>  is extremely variable and depends on the condition leading to<unk> , whether one (unilateral) or both (bilateral) kidneys are affected, the pre-existing kidney function, the duration of<unk>  (acute or chronic), and whether<unk>  occurred in developing or mature kidneys. Permanent kidney damage can occur from prolonged<unk>  secondary to compression of kidney tissue and ischemia. For example, unilateral<unk>  caused by an obstructing stone will likely resolve when the stone passes, and the likelihood of recovery is excellent. Alternately, severe bilateral prenatal<unk>  (such as occurs with posterior urethral valves) will likely carry a poor long-term prognosis, because obstruction while the kidneys are developing causes permanent kidney damage even if the obstruction is relieved postnatal.<unk>  can be a cause of pyonephrosis, which is a urological emergency.
Hydronephrosis
Pyonephrosis
Glomerulonephrosis
Pyelonephritis
Ureteric stricture
Ureteral cancer
Salpingitis
Obstructive uropathy