Characteristics of retroperitoneal tumors in contrast-enhanced ultrasound        LIANG Jin-yu, ZHENG Yan-ling, XIE Xiao-yan, et al. Department of Medical Ultrasound, Institute of Diagnostic and Interventional Ultrasound, First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
Corresponding author: XIE Xiao-yan, E-mail: xxy1992@21cn.com
Abstract    Objective    To summarize characteristics of basic ultrasound and contrast-enhanced ultrasound (CEUS) of benign and malignant retroperitoneal tumors. Methods    The clinical data 27 cases of retroperitoneal tumors (9 cases of benign tumors and 18 cases of malignant tumors) performed basic ultrasound and CEUS between March 2004 and March 2013 in Department of Medical Ultrasound, the First Affiliated Hospital, Sun Yat-sen University were analyzed retrospectively. Size, shape, homogeneity of echo and tumor blood flow of CDFI between benign and malignant tumors were compared. Results    Size, shape, homogeneity of echo, and tumor blood flow of CDFI compared between benign and malignant tumors had no significant difference statistically（P>0.05）. Enhanced pattern of CEUS between benign and malignant tumors had significant differences statistically（P<0.05）. Most benign retroperitoneal tumors（88.9%） enhanced from periphery to centre, however 55.6% of malignant ones enhanced from centre to periphery. The homogeneity of enhancement and clarity of post-enhancement showed no significant difference statistically between benign and malignant tumors（P>0.05）. Conclusion    CEUS combined with basic ultrasound may help distinguish malignant retroperitoneal tumors from benign ones, which still need more samples to prove.