Abstract: Breast cancer is the most common malignant tumor in women. The status of axillary lymphnodes is of great significance to breast cancer patients. Ultrasound is one of the most important method to evaluatethe status of axillary lymph nodes. Conventional ultrasound can evaluate the status of axillary lymph nodes from theshape，internal echo and blood flow distribution，while elastic imaging and contrast⁃enhanced ultrasound can betterjudge the benign and malignant of axillary lymph nodes through the hardness and blood flow perfusion of axillarylymph nodes. Ultrasound⁃guided biopsy can provide pathological information of axillary lymph nodes and furtherimprove the accuracy of diagnosis. The development of artificial intelligence technology also provides more refer⁃ence for ultrasound to evaluate axillary lymph nodes of breast cancer patients. The advances of different ultrasoundtechniques used in axillary lymph nodes of breast cancer was reviewed in this article.

Key words: ultrasonography, breast cancer, axillary lymph nodes, metastasis