Renal oncocytoma was previously reported as a benign tumor arising from proximal tubular epithelial cells, but malignant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。