以下为句子列表：
英文: Renal oncocytoma was previously reported as a benign tumor arising from proximal tubular epithelial cells, but malignant potential with local invasion and distant metastasis has been emphasized in recent literature.
中文: 摘要肾嗜酸性细胞瘤，早期被认为是一种又肾近侧曲小管上皮细胞卫生之肿瘤，后来发现其具有处转移的恶性特质。
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