Table 5.

Magnetic resonance imaging in type I IgG4-sclerosing cholangitis (Type I IgG4-SC), isolated IgG4-sclerosing cholangitis, primary sclerosing cholangitis (PSC) and recurrent pyogenic cholangitis (isolated IgG4-SC).

Type IgG4-SCa	Isolated IgG4-SC	PSC [93]	Recurrent pyogenic cholangitis
Type1: involvement of lower part of bile duct only Type 2a: involvement of distal bile duct and intrahepatic bile duct with proximal dilation Type 2b: involvement of distal bile duct and diffuse intrahepatic bile duct without proximal dilation Type 3: involvement of distal bile duct and ducts at hepatic hilum Type 4: involvement of ducts at hepatic hilum only	Absence of intra-hepatic bile ducts, bile duct lesions. Cholangiographic findings based on Nakazawa classificationa	Ductal irregularities of the intra- and extra hepatic biliary tree. Stenosis and saccular dilations (beaded appearance). Pruned-tree appearance at chronic stage	Dilated intrahepatic bile ducts, bile duct strictures, calculi within dilated bile ducts and morphologic changes like atrophy

^aNakazawa classification [92].