目的:探讨乳腺癌内乳淋巴结(internal mammary lymph node，IMLN)转移的超声图像特点及危险因素。方法:回顾性分析2010年3月至2020年5月河北医科大学第四医院收治的新发乳腺癌患者296例，IMLN以病理结果为诊断标准，分为转移组(236例)和未转移组(60例)，应用卡方检验、独立样本n t检验分析IMLN转移的声像图特点及与转移相关的因素，ROC曲线分析IMLN长径、厚径、皮质增厚阈值及其诊断转移的敏感性、特异性。采用单因素及多因素Logistic分析确定IMLN转移的危险因素。n 结果:①IMLN超声表现分为四型：正常结构型，皮质增厚型，淋巴结门结构不清型和结节状软组织增厚型。②两组中，IMLN长径、厚径、个数及淋巴门结构类型差异有统计学意义(均n P0.05)。③诊断转移的IMLN长径阈值为10.5 mm，ROC曲线下面积(AUC)为0.825，敏感性、特异性分别为58.5%、93.3%；厚径阈值为4.5 mm，AUC为0.790，敏感性、特异性分别为66.9%、75.0%；长径联合结构类型、厚径联合结构类型诊断的敏感性及特异性分别为56.3%、93.3%及64.8%、81.7%；皮质厚度阈值为1.9 mm，诊断敏感性及特异性分别为91.9%、86.7%。④IMLN转移的危险因素：单因素分析提示乳腺肿物长径与体积、腋窝转移淋巴结长径、腋窝淋巴结及锁骨下淋巴结转移两组比较差异有统计学意义(均n P<0.05)；多因素分析提示乳腺肿物长径及腋窝淋巴结转移是IMLN转移的独立危险因素。n 结论:转移的IMLN多表现为无淋巴门结构或者皮质增厚(≥1.9 mm)，且IMLN多发有助于诊断转移。超声能较好地评估乳腺癌IMLN转移，IMLN长径联合结构类型的诊断效能更高。IMLN转移的独立危险因素为乳腺肿物长径及腋窝淋巴结转移。“,”Objective:To investigate the ultrasonographic characteristics and risk factors of breast cancer internal mammary lymph node (IMLN) metastasis.Methods:A retrospective analysis of 296 first diagnosed breast cancer patients in the Fourth Hospital of Hebei Medical University from March 2010 to May 2020. IMLN was divided into metastatic group (236 cases) and non-metastatic group (60 cases) based on pathology. Chi-square test and independent sample n t test were used to analyze the ultrasound characteristics of IMLN metastasis and factors related to metastasis. ROC curve analysis of IMLNs were plotted to obtain the diagnostic thresholds and their sensitivity and specificity.Univariate and multivariate Logistic analysis was used to analyze the risk factors of IMLN metastasis.n Results:①The appearances of IMLN in ultrasound were normal type, thickened-cortex type, unclear hilus structure type and thickened-nodular soft tissue type. ②In the two groups, the differences in IMLN long diameter, thickness diameter, number, and lymphatic hilum structure type were statistically significant (all n P0.05). ③The long diameter threshold of IMLN for diagnosis of metastasis was 10.5 mm, the are under the ROC curve(AUC) was 0.825, with sensitivity of 58.5% and specificity 93.3%; thickness and diameter threshold was 4.5 mm, AUC was 0.790, with sensitivity 66.9% and specificity 75.0%. The sensitivity and specificity of the diagnosis of long-diameter combined structure type were 56.3% and 93.3%, respectively; the sensitivity and specificity of the diagnosis of thick-diameter combined structure type were 64.8% and 81.7%, respectively. The cortical thickness threshold was 1.9 mm, and the diagnostic sensitivity and specificity were 91.9% and 86.7%, respectively. ④The risk factors of IMLN metastasis inculded univariate analysis showed tumor length, tumor volume, axillary lymph node long diameter, axillary lymph node metastasis, and clavicle lymph node metastasis. There was a statistically significant difference in the pathology of the lower lymph nodes between the two groups (n P<0.05). Multivariate analysis showed that the long diameter of the tumor and the metastasis of the axillary lymph nodes were independent risk factors of IMLN metastasis.n Conclusions:The metastatic IMLN mostly manifest as no lymphatic hilum structure or cortical thickening (≥1.9 mm), and multiple IMLN can help diagnose metastasis.Ultrasound can better assess breast cancer IMLN metastasis, and the diagnostic efficiency of IMLN long-diameter combines structure type is higher.Independent risk factors for IMLN metastasis include tumor size and axillary lymph node metastasis.