以下为句子列表：
英文: Conclusion Ultrasonic approach is the first choice for diagnosis low segment ureteral polyp, and it is more valuable in patients complicated with X-ray negative stone, difficult for retrograde urethrography and allergy to iodine.
中文: 结论超声是输尿管下段息肉的首选筛查方法，对合并阴性结石、逆行造影困难、碘过敏者更具有价值。
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