肾盂输尿管移行区
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The transition zone of the renal pelvis and ureter
以上为机器翻译结果，长、整句建议使用 人工翻译 。
输尿管第一狭窄50%位于肾盂输尿管移行区，50%位于近段输尿管。
The 50% first stenosis is located in the ureteropelvic junction and another 50% is located in the upper ureter.
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