Objective To evaluate the ultrasonographic ( US ) findings of granulomatous lobular mastitis( GLM ) ,and to compare the diagnostic accuracy among US ,mammographic ,and magnetic resonance imaging ( MRI) . Methods Imaging characteristics of 56 patients who were pathologically comfirmed as GLM were reviewed .All the lesions were assessed by BI‐RADS ( Breast Imaging Reporting and Data System) . Results Fifty‐eight lesions were found in 56 patients . Thirty ( 51 .7% ) were irregular ,20 (34 .5% ) were lobular and 8(13 .8% ) were round or oval in shape . Forty two lesions (72 .4% ) were hypoechoic ,14 (24 .1% ) were mixed echoic textur ,including 6 lesions (10 .3% ) with tubular connections and 8 lesions ( 13 .8% ) with irregular markly hypoechoic internal echoes . Two ( 3% ) were isoechoic .No calcification were found . Color Doppler signals were detected in 33 cases(56 .9% ) ,and the resistance index ( RI) ranged from 0 .61 to 0 .79 . Forty patients underwent mammography ,there were no distinct lesions in 6 cases(15% ) ,suspicious calcification in two(5% ) , asymmetric density in twenty(50% ) ,and solitary masses in twelve(30% ) . MRI was performed in 36 patients ,and revealed no abnormality in two patients(5 .6% ) , twenty nine lesions ( 80 .6% ) showed hypointensity on T1‐weighted images and hyperimensity on T2‐weighted images ,five lesions ( 13 .9% ) showed isointensity on T1‐weighted images and hyperimensity on T2‐weighted images ,and all the lesions showed heterogeneous enhancement after contrast .The diagnostic accuracy of ultrasonography , mammography and MRl was 63 .8% , 45% and 61 .1% , respectively . Conclusions There were no specific imaging characteristics of GLM ,the combination of ultrasonography , mammography and MRI might benefit the diagnosis of GLM .%目的：探讨肉芽肿性小叶性乳腺炎的声像图特征，并比较超声、X线及M RI的诊断价值。方法分析56例病理证实为肉芽肿性小叶性乳腺炎患者的超声、X 线、 M RI 特征，并根据BI‐RADS进行分类。结果56例患者共58个病灶，30个（51.7％）不规则形，20个（34.5％）分叶状，8个（13.8％）圆形或椭圆形。42个（72.4％）呈低回声；14个（24.1％）呈混合性回声，内见管状弱－无回声6个（10.3％），不规则弱回声8个（13.8％）；2例（3％）呈等回声。所有病例均未见明显钙化。33个（56.9％）病灶内见血流信号，阻力指数0.61～0.79。40例行X线检查，6例（15％）未发现明确病灶，2例（5％）可疑钙化灶，20（50％）例表现为非对称致密影，12例（30％）表现为肿块影。36例行M RI检查，2例（5.6％）未发现明确病灶；29例（80.6％） T1WI低信号， T2WI高信号；5例（13.9％） T1WI等信号， T2WI高信号，增强后病灶均不均匀强化。超声、X线和 M RI对良恶性的诊断准确率分别为63.8％、45％、61.1％。结论肉芽肿性小叶性乳腺炎缺乏特异性影像学特征，超声、X线和M RI相结合有助于该病的诊断。
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