目的    探讨基础超声联合超声造影腹膜后良恶性肿物的特征。方法    回顾性分析2004年3月至2013年3月间中山大学附属第一医院超声科进行常规超声检查及超声造影的27例腹膜后肿瘤（良性9例，恶性18例）病人病例资料。总结病变的超声特征，包括大小、形态、回声均匀性、边界、血流以及超声造影特征包括增强形态、均匀性、增强后边界，比较良恶性病变有无差异。结果    腹膜后良恶性病变的大小、形态、回声均匀性、边界及血流差异均无统计学意义（P>0.05）。增强形态（周边向中央增强和中央向周边增强）良恶性病变之间差异有统计学意义，良性病变中由周边向中央增强为88.9%，恶性病变中由中央向周边增强为55.6%，良恶性病变增强均匀性和增强后边界比较差异均无统计学意义（P>0.05）。结论    超声造影可能有助于腹膜后肿瘤良恶性的鉴别诊断，须增加样本量进一步总结。

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.