The positive predictive value is 97.7%. [Conclusion] FNA is usefule for differentiating benign and maglignant mass, especially distinguishing cancer from plasma cell mastitis.

• 结论细针吸引细胞学检查对乳腺肿块晟恶性的鉴别上提供了可靠的依据，尤其对鉴别乳腺癌和浆细胞性乳腺炎有帮助。