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====Ultrasonography====
====Ultrasonography====
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.
===Histopathology===
===Histopathology===