<unk>  is a urologic disease consisting of a decrease in the free passage of urine through one or both ureters and/or the urethra. It is a cause of<unk>  retention. Complete obstruction of the<unk><unk>  requires prompt treatment for renal preservation. Any sign of infection, such as fever and chills, in the context of obstruction to urine flow constitutes a urologic emergency.
Urinary tract obstruction
Bladder outlet obstruction
Prostatic congestion
Urethral stricture
Ureteric stricture
Obstructive uropathy
Hydronephrosis
Pyonephrosis