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1·Conclusion:MTASCC of the kidney is a distinctive low-grade renal neoplasm probably arising from distal nephron. The nucleus of tumor cells are round or spindle with less atypia.

结论：肾脏黏液性小管状和梭形细胞癌是一种低度恶性的肾肿瘤，肿瘤细胞核圆形或梭形，异型性很小，可能来源于远端肾单位。