目的 回顾性分析3.0T MR扩散加权成像对乳腺浸润性导管癌的诊断价值。方法 纳入我院经手术病理证实为青年型乳 腺病变的患者106例，所有病例均行3.0T MR扩散加权成像以及X线检查，对病灶的MRI特点进行分析。结果 青年型良恶性病 变的形态表现以及两者的边缘特征有显著统计学意义（P＜0.05）；青年乳腺良恶性病变T1WI和T2WI信号强度分布有差异， 但是两指标在良恶性中的信号分布差异无显著统计学意义（P＞0.05）；恶性病变的ADC值显著低于良性病变（P＜0.05）； 3.0T MR扩散加权成像显示诊断乳腺浸润性导管癌的敏感度为97.6%，特异度为77.8%，阳性预测值为87.2%，阴性预测值为 95.5%，准确度为89.9%，各项指标均高于X线检查。结论 3.0T MR扩散加权成像检查可为乳腺浸润性导管癌的诊断提供极其重 要的依据，能提高疾病的鉴别诊断。

Objective To retrospectively analyze the diagnostic value of 3.0T MR diffusion weighted imaging in breast invasive ductal carcinoma. Methods A total of 106 patients with young breast lesions confirmed by surgical pathology in our hospital were enrolled. All patients underwent 3.0T MR diffusion weighted imaging and X-ray examination to analyze the MRI features of the lesions. Results There were significant differences in the morphological features and marginal features between benign and malignant lesions in young patients (P<0.05). The distribution of T1WI and T2WI signal intensity in young benign and malignant breast lesions was different, but there was no statistically significant difference in these two indicators between benign and malignant breast lesions (P>0.05). The ADC value of malignant lesions was significantly lower than that of benign lesions (P<0.05). 3.0T MR diffusion weighted imaging showed that the sensitivity, specificity, positive predictive value, negative predictive value and accuracy of diagnosis of breast invasive ductal carcinoma were 97.6%, 77.8%, 87.2%, 95.5% and 89.9%, respectively, which were higher than those of X-ray examination. Conclusion 3.0T MR diffusion weighted imaging can provide an important basis for the diagnosis of invasive ductal carcinoma of the breast, which can improve the differential diagnosis of the disease.