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http://dx.doi.org/10.3348/kjr.2015.16.2.334

Qualitative and Quantitative Analysis with Contrast-Enhanced Ultrasonography: Diagnosis Value in Hypoechoic Renal Angiomyolipoma  

Lu, Qing (Shanghai Imaging Institute of Medicine, Department of Ultrasound, Zhongshan Hospital, Fudan University)
Huang, Bei-jian (Shanghai Imaging Institute of Medicine, Department of Ultrasound, Zhongshan Hospital, Fudan University)
Wang, Wen-ping (Shanghai Imaging Institute of Medicine, Department of Ultrasound, Zhongshan Hospital, Fudan University)
Li, Cui-xian (Shanghai Imaging Institute of Medicine, Department of Ultrasound, Zhongshan Hospital, Fudan University)
Xue, Li-yun (Shanghai Imaging Institute of Medicine, Department of Ultrasound, Zhongshan Hospital, Fudan University)
Publication Information
Korean Journal of Radiology / v.16, no.2, 2015 , pp. 334-341 More about this Journal
Abstract
Objective: To evaluate the value of enhancement features and quantitative parameters of contrast-enhanced ultrasonography (CEUS) in differentiating solid hypoechoic renal angiomyolipomas (AMLs) from clear cell renal cell carcinomas (ccRCCs). Materials and Methods: We analyzed the enhancement features and quantitative parameters of CEUS in 174 hypoechoic renal masses (32 AMLs and 142 ccRCCs) included in the study. Results: Centripetal enhancement pattern was more common in AMLs than in ccRCCs on CEUS (71.9% vs. 23.2%, p < 0.001). At peak enhancement, all AMLs showed homogeneous enhancement (100% in AML, 27.5% in ccRCCs; p < 0.001). Quantitative analysis showed no significant difference between rise time and time to peak. Tumor-to-cortex (TOC) enhancement ratio in AMLs was significantly lower than that in ccRCCs (p < 0.001). The criteria of centripetal enhancement and homogeneous peak enhancement together with TOC ratio < 91.0% used to differentiate hypoechoic AMLs from ccRCCs resulted in a sensitivity and specificity of 68.9% and 95.8%, respectively. Conclusion: Both qualitative and quantitative analysis with CEUS are valuable in the differential diagnosis of hypoechoic renal AMLs from ccRCCs.
Keywords
Angiomyolipoma; Renal cell carcinoma; Contrast-enhanced ultrasonography; Quantitative analysis; Minimal fat;
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