Table 1:

Mimics of PSC

Categories	Examples
Infectious	AIDS cholangiopathy (e.g. C. parvum, CMV)
	Helminthic infection (e.g. Clonorchis, Opisthorchis, Ascaris)
	Recurrent pyogenic cholangitis (i.e. “oriental cholangiohepatitis”)
Neoplastic	Cholangiocarcinoma
	Diffuse intrahepatic malignancy (primary or metastatic)
Immunologic	IgG4-associated cholangiopathy
	Eosinophilic cholangitis
	Mast cell cholangiopathy
	Histiocytosis X
	Systemic vasculitis
	Hepatic allograft rejection
	Primary biliary cirrhosis
Ischemic	Post-transplant non-anastomotic strictures
	Post-intraarterial chemotherapy
	Post-radiation therapy
Inflammatory	Recurrent pyogenic cholangitis
	Chronic pancreatitis
Miscellaneous	Mirizzi syndrome
	Compressive lymphadenopathy
	Portal hypertensive biliopathy
	Post-operative biliary strictures
	Choledochal cyst (e.g. Caroli’s disease)
	Progressive familial intrahepatic cholestasis

Key: AIDS, acquired immune deficiency syndrome; CMV, cytomegalovirus; IgG4, immunoglobulin G subclass 4; PSC, primary sclerosing cholangitis.