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Sclerosing cholangitis following human orthotopic liver transplantation.
American Journal of Surgical Pathology 1995 January
Sclerosing cholangitis defined by cholangiographic criteria may occur after orthotopic liver transplantation. In this retrospective study, we analyzed failed grafts and antecedent serial biopsies of 24 patients who developed this type of nonanastomotic biliary strictures. Sclerosing cholangitis was histologically diagnosed if there was a combination of periductal fibrosis and features of large bile duct obstruction. The condition was observed in all but one available failed allografts. This later showed ischemic-type lesions without periductal fibrosis. Liver biopsy specimens were nondiagnostic relative to sclerosing cholangitis, although 85% of the patients had evidence of large bile duct obstruction. Numerous associated factors may explain the pathogenesis of secondary sclerosing cholangitis: an immunologically related etiologic factor (10 recipients of ABO-incompatible allografts) and compromised arterial blood flow that likely resulted from hepatic artery thrombosis (12 patients), focal arterial fibrointimal hyperplasia (three patients), chronic ductopenic arteriopathic rejection (three patients) and/or preservation-related ischemia (four patients). Sclerosing cholangitis may be a significant cause of graft failure that often has misleading biopsy manifestations. From a practical standpoint, cholestasis with evidence of large bile duct obstruction warrants cholangiographic assessment of the biliary tree.
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