What is the intrahepatic biliary radicles are not dilated?

That is normal: Intrahepatic bile ducts are small ducts within the liver that collect bile from the liver cells and transport it into increasingly larger bile ductules that coalesce into a single bile duct, the common bile duct. Normally by ultrasound or body scans, only the larger bile ducts can be seen. If the intrahepatic bile ducts are dilated, it means there is a blockage downstream, which is abnormal.