Ultrasonograpy is more helpful and biliary tract dilation can be seen in all cases. Common bile duct is normally dilated and the gallbladder may also be dilated with "sludge". Main differential is extrahepatic biliary obstruction. | Ultrasonograpy is more helpful and biliary tract dilation can be seen in all cases. Common bile duct is normally dilated and the gallbladder may also be dilated with "sludge". Main differential is extrahepatic biliary obstruction. |