Contrast-enhanced US for characterization of focal liver lesions: a comprehensive meta-analysis
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This meta-analysis was performed to evaluate the accuracy of contrast-enhanced ultrasound (CEUS) in differentiating malignant from benign focal liver lesions (FLLs).
Cochrane Library, PubMed and Web of Science databases were systematically searched and checked for studies using CEUS in characterization of FLLs. Data necessary to construct 2×2 contingency tables were extracted from included studies. The QUADAS tool was utilized to assess the methodologic quality of the studies. Meta-analysis included data pooling, subgroup analyses, meta-regression and investigation of publication bias was comprehensively performed.
Fifty-seven studies were included in this meta-analysis and the overall diagnostic accuracy in characterization of FLLs was as follows: pooled sensitivity, 0.92 (95%CI: 0.91–0.93); pooled specificity, 0.87 (95%CI: 0.86–0.88); diagnostic odds ratio, 104.20 (95%CI: 70.42–154.16). Subgroup analysis indicated higher diagnostic accuracy of the second-generation contrast agents (CAs) than the first-generation CA (Levovist; DOR: 118.27 vs. 62.78). Furthermore, Sonazoid demonstrated the highest diagnostic accuracy among three major CAs (SonoVue, Levovist and Sonazoid; DOR: 118.82 vs. 62.78 vs. 227.39). No potential publication bias was observed of the included studies.
CEUS is an accurate tool to stratify the risk of malignancy in FLLs. The second-generation CAs, especially Sonazoid may greatly improve diagnostic performance.
• CEUS shows excellent diagnostic accuracy in differentiating malignant from benign FLLs.
• The second-generation CAs have higher diagnostic accuracy than first-generation CAs.
• Sonazoid demonstrates the highest diagnostic accuracy among three major CAs.
KeywordsUltrasonography Contrast media Liver neoplasms Diagnosis Meta-analysis
Focal liver lesions
Quality Assessment of Diagnostic Accuracy Studies
Diagnostic odds ratio
Positive likelihood ratio
Negative likelihood ratio
Hierarchical summary receiver operating characteristic
Area under the curve
Relative diagnostic odds ratio
This study has received funding by the Youth Science Foundation of the Second Hospital Center Laboratory of Tianjin Medical University (2016YDEY01), Science Foundation of Tianjin Medical University (2016KYZQ06 and 2014KYM15), Foundation of Tianjin Health and Family Planning Commission (16KG115).
Compliance with ethical standards
The scientific guarantor of this publication is Xuening Zhang.
Conflict of interest
The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
Statistics and biometry
No complex statistical methods were necessary for this paper.
Written informed consent was not required for this study because the study concerns a meta-analysis.
Institutional review board approval was not required because the study concerns a meta-analysis.
• diagnostic study
• performed at one institution
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