胆道梗阻是由于胆管腔狭窄或阻塞所致的胆汁通过障碍,临床出现以阻塞性黄疸为主要临床表现的胆汁代谢障碍综合征。胆道梗阻诊断的建立,一般认为CT是首选方法。胆道梗阻发生后,病理改变主要是胆道扩张和黄疸,梗阻早期胆管可以没有扩张,梗阻2周以上CT诊断的准确率是85%~100%[1],? Biliary obstruction is due to bile duct stricture or obstruction caused by the bile through the barrier, the clinical appearance of obstructive jaundice as the main clinical manifestations of biliary metabolic syndrome. Diagnosis of biliary obstruction is generally believed that CT is the preferred method. Biliary obstruction, the pathological changes mainly biliary dilatation and jaundice, obstruction early bile duct can not be expanded, obstruction more than 2 weeks the accuracy of CT diagnosis is 85% to 100% [1] ,?