Ultrasonography is more helpful. Biliary tract dilation can be seen in all cases. Common bile duct is normally dilated and the [[Gall Bladder - Anatomy & Physiology|gall bladder]] may also be dilated with "sludge". Main differential is extrahepatic biliary obstruction. | Ultrasonography is more helpful. Biliary tract dilation can be seen in all cases. Common bile duct is normally dilated and the [[Gall Bladder - Anatomy & Physiology|gall bladder]] may also be dilated with "sludge". Main differential is extrahepatic biliary obstruction. |