CT features only for biliary tract dilation in malignant and benign obstructive jaundice were analysed.The authors found that modertedly and markedly dilated(73.1%) of intrahepatic ductm

or in viny like dilation(57.7%)and abrupt termination of mostly dilated distal in portion of extrahepatic biliary duct (95.7%) was characteristic of malignant lesion.Minimally dilated of intrahepatic duct (63.6%)

or in bamboo (68.2%)

and gradual tapering at proximal portion of extrahepatic dialated duct (84.2%)was specific for benign disease.According to the degree and shape of dilated intrahepatic bile ducts

the changes of dilated cxtahepatic bilie duct

could distingnish malignant from benign obstruction.