Table 1. FLD classification according to the level of biliary tree involvement.

Disease	Biliary tree level involved	Size
VMC	Small intralobular bile ducts	<20 μm
CHF	Interlobular and septal bile ducts	20–50 μm
Caroli’s disease	Larger intrahepatic bile ducts	>50 μm
Caroli’s syndrome	From interlobular to larger intrahepatic bile ducts (CHF + CD)	>20 μm
Choledochal cysts	Extrahepatic bile ducts	2–8 mm