ObjectiveTo systematically review the value of ultrasound contrast agents injected subcutaneously for diagnosing sentinel lymph nodes of breast cancer. MethodsWe electronically searched databases including PubMed, EMbase, The Cochrane Library, CNKI, CBM, WanFang Data, and Medalink from their inception to July 2014, to collect diagnostic accuracy studies of ultrasound contrast agents injected subcutaneously for diagnosing sentinel lymph nodes of breast cancer. Two reviewers independently screened literature according to the inclusion and exclusion criteria, extracted data and assessed the methodological quality of included studies. Then, meta-analysis was performed by using Meta-Disc 1.4 software. ResultsEight studies involving 311 sentinel lymph nodes were included. The results of meta-analysis showed that, the pooled sensitivity, specificity, positive likelihood ratio, negative likelihood ratio, diagnostic odds ratio, and the area under curve (AUC) of SROC were 0.89 (95%CI 0.84 to 0.93), 0.81 (95%CI 0.72 to 0.87), 4.14 (95%CI 2.20 to 7.79), 0.15 (95%CI 0.10 to 0.25), 33.23 (95%CI 11.17 to 98.83), and 0.96 respectively. ConclusionContrast-enhanced ultrasound has a high value in diagnosis of sentinel lymph nodes of breast cancer. Due to limited quality and quantity of the included studies, more high quality and large-scale studies are needed to verify the above conclusion.