以下为句子列表：
英文: It is closely associated with urolithiasis, chronic infection and obstruction.
中文: 在文献报告中它与尿道结石、慢性感染及阻塞有密切的关系。
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英文: Squamous cell carcinoma of the renal pelis is an uncommon tumor that is associated with calculi, chronic infection and perhaps with horseshoe kidney.
中文: 肾盂鳞状细胞癌不多见，常合并结石、慢性炎症或马蹄肾。
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