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.

• 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。