目的 研究磁共振成像(MRI)在鉴 别诊断乳腺良恶性病变中临床价值。方法 我院2013年3月至2016年9月85例乳腺疾病 患者(94个病灶)为研究对象，行MRI平扫 与动态增强扫描，所有患者均经术后病理 证实，评估MRI平扫与MRI增强对乳腺疾病 良恶性病变诊断的灵敏度、特异度、阳性 预测值、阴性预测值、准确率。结果 MRI 平扫诊断的灵敏度、特异度、准确率分别 为82.1%、84.2%、83.0%。MRI增强诊断的 灵敏度、特异度、准确率92.9%、94.7%、 93.6%。MRI增强诊断准确率为93.6%显 著高于MRI平扫的83.0%(χ2 =5.148，P ＜0.05）。结论 MRI在诊断乳腺良恶性病 变具有较高灵敏度、特异度，动态增强成 像可以强化乳腺良恶性病变形态学特征， 提高MRI诊断准确率。

Objective To study the clinical value of magnetic resonance imaging (MRI) in differential diagnosis of benign and malignant breast lesions. Methods A total of 85 patients with breast diseasesadmitted to the hospital between March 2013 and September 2016 were enrolled in the study. MRI plain scan and dynamic enhanced scanning were performed, and all patients were confirmed by pathology. The sensitivity, specificity, positive predictive value, negative predictive value and accuracy of MRI plain scan and MRI enhanced scan in the diagnosis of benign and malignant breast lesions were evaluated. Results The sensitivity, specificity and accuracy of MRI plain scan were 82.1%, 84.2% and 83.0%, respectively while of MRI were 92.9%, 94.7% and 93.6%, respectively. The diagnostic accuracy of MRI (93.6%) was higher thanMRI plain scan (83.0%) (χ2 =5.148, P<0.05). Conclusion The sensitivity and specificity of MRI are high in the diagnosis of benign and malignant breast lesions. Dynamic contrast-enhanced imaging can improve the morphological features of benign and malignant breast lesions and improve the diagnostic accuracy of MRI.