OBSTRUCTIVE UROPATHY - A sudden disorder which results in the complete blockage of urine flow out the bladder and/or urethra. Pressure rises in the urinary tract causing a backward pressure on the kidneys. Bilateral hydronephrosis (kidney enlargement), hypertension, and damage to the kidneys (acute renal failure) will occur if the obstruction is not relieved. Causes include prostate disease, tumors, and cystocele.