以下为句子列表：
英文: 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.
中文: 用金属探针指示了在输尿管口的长期阻塞（可能是先天性的）。此处明显肾盂积水和输尿管积水由阻塞引起。
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英文: If this process is unilateral, then the problem originates from the ureteral orifice up to the pelvis.
中文: 如果病变是单侧的，原因可能是从肾盂到输尿管口的病变。
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