目的 探讨MRI增强扫描与钼靶 成像在诊断乳腺导管原位癌(DCIS)中应 用价值。方法 回顾性分析42例经临床 病理证实为DCIS患者的钼靶、MRI影像 学资料，分析两种影像学方式单独及联 合诊断准确率。结果 钼靶检查显示， 71.43%患者为BI-RADS 4-5级，典型表现 为特征性密集的钙化病灶。MRI检查显 示，83.33%患者为BI-RADS 4-5级，典 型表现为增强扫描非肿块强化、TIC 曲 线呈Ⅱ-Ⅲ型。以临床病理检查为“金 标准”，钼靶+MRI诊断DCIS的准确率为 92.86%高于钼靶(71.43%)(P＜0.05)，略 高于MRI(83.33%)(P＞0.05)。结论 DCIS 在钼靶、MRI上均存在特征性表现，两者 联合诊断可提高诊断准确率。

Objective To evaluate the application value of magnetic resonance imaging (MRI) enhanced scanning and mammography in the differential diagnosis of breast ductal carcinoma in situ (DCIS). Methods The imaging findings of mammography and MRI of 42 patients with clinically and pathologically confirmed DCIS were analyzed retrospectively. The accuracy rates of alone or combined diagnosis of the two imaging methods were analyzed. Results Mammography showed that 71.43% of the patients were BI-RADS grade 4-5, and the typical manifestation was characteristic dense calcification lesions. MRI examination showed that 83.33% of the patients were BI-RADS grade 4-5, and the typical manifestations were non-tumor enhancement and II-III type TIC. With the clinical and pathological examination as the golden standard, the accuracy of mammography combined with MRI in the diagnosis of DCIS (92.86%) was higher than that of mammography (71.43%) alone (P<0.05) and slightly higher than MRI (83.33%) alone(P>0.05). Conclusion Both of mammography and MRI show characteristic manifestations of DCIS and the combined diagnosis can improve the diagnostic accuracy.