Table 1.

Ductal scoring system.

Intrahepatic ducts (10 mm proximal from hilum)

0 No visible abnormalities

1 Multiple strictures, normal caliber of bile ducts or minimal dilatation

2 Multiple strictures, saccular dilatations, decreased arborization

3 Only central branches seen, diffuse severe pruning

Extrahepatic ducts

0 No visible abnormalities

1 Slight irregularities of duct contour, no stricture

2 Segmental strictures

3 Stricture of almost entire length of duct

4 Extremely irregular margin, diverticulum-like outpouchings