目 的 探讨并比较超声造影 (contrast-enhanced ultrasound，CEUS) 和增强MRI诊断肝外胆管癌(extrahepatic cholangoocarcinoma,EHCC)的影像学特 征及应用价值。方法 回顾性分析2014 年2月-2016年2月医院经手术确诊的78 例EHCC患者病例资料，均行CEUS和增强 MRI检查，分析其影像学特征及检查准 确率。结果 两种检查动脉期增强水平 比较差异无显著性(P＞0.05)，CEUS显 示门脉期、延迟期低增强的几率分别为 91.03%、100.0%高于增强MRI的10.26%、 8.97%(P＜0.05)；CEUS达到峰值时不均 匀增强几率和检查准确率与增强MRI比较 差异无显著性(P＞0.05)。结论 CEUS、增 强MRI诊断EHCC均有特征性表现，且CEUS 可作为增强MRI诊断的有益补充，进一步 提高检查准确率。

Objective To investigate and compare the imaging features and diagnostic value of contrast-enhanced ultrasound (CEUS) and contrast-enhanced MRI in extrahepatic cholangiocarcinoma (EHCC). Methods The clinical data of 78 patients with EHCC confirmed by operation in our hospital between February 2014 and February 2016 were analyzed retrospectively. All patients underwent CEUS and contrast-enhanced MRI examination. The imaging features and the accuracy rates of examinations were analyzed. Results There was no significant difference in the level of enhancement in arterial phase between the two groups (P＞0.05). The probabilities of low enhancement in portal vein phase and delay phase displayed by CEUS (91.03%, 100.0%) were higher than those of MRI (10.26%, 8.97%) (P＜0.05). There were no significant differences between CEUS and MRI in inhomogeneous enhancement at peak value and the accuracy of detection (P ＞0.05). Conclusion The findings of CEUS and contrast-enhanced MRI are characteristic in the diagnosis of EHCC. CEUS can be used as a useful supplement to MRI diagnosis, further improving the diagnostic accuracy.