The stasis from obstruction predisposes to infection. The obstruction can also lead to bilateral hydroureter and hydronephrosis.
阻塞导致的郁积易于引起感染，同时阻塞还能引起双侧的输尿管积水和肾盂积水。
3
A long-standing obstruction (probably congenital) at the ureteral orifice through which the metal probe passes led to the marked hydroureter and hydronephrosis seen here.