What causes renal pelvis dilatation?

Uterine ureteral obstruction is the most common cause of hydronephrosis. Uterine ureteral obstruction is usually caused by ureteral obstruction. Uterine ureteral obstruction is usually caused by ureteral stricture, ureteral stones, etc. For bilateral hydronephrosis, it is usually caused by lower urinary tract obstruction. For example, prostate hyperplasia, urethral stricture and female bladder neck sclerosis are common causes of bilateral hydronephrosis. For renal pelvis dilation, hydronephrosis treatment generally needs to remove obstruction, only the urinary tract obstruction can be relieved, so that renal pelvis dilation is recovered.