A 20-year-old patient, G1P0, was referred after ultrasound findings of bladder dilatation and bilateral pyelectasis at 18 weeks GA.Her medical history was unremarkable.

• 一20岁患者，G1P0，孕18周时因超声发现膀胱膨胀和双侧肾盂扩张就诊，其既往病史不明显。