Abstract
Autoimmune hepatitis (AIH) is a progressive inflammatory liver disorder affecting mainly females, characterized serologically by high levels of transaminases and immunoglobulin G (IgG), and presence of autoantibodies, and histologically by interface hepatitis, in the absence of a known etiology. AIH responds satisfactorily to immunosuppressive treatment. If left untreated, it progresses rapidly to cirrhosis and liver failure.
The clinical phenotype of AIH in children differs from that of adults. The juvenile form of AIH is subdivided into two types according to the autoantibody profile: type 1, positive for anti-nuclear (ANA) and/or anti-smooth muscle (SMA) antibody, and/or type 2, positive for anti-liver kidney microsomal antibody type 1 (anti-LKM-1) or anti-liver cytosol type 1 (anti-LC1), autoantibodies rarely described in adult patients. Both AIH types are associated with other autoimmune disorders (about 20%) and a family history of autoimmune disease (40%). Type 2 AIH can be part of the autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED) syndrome, an autosomal recessive genetic disorder in which the liver disease is reportedly present in some 20% of patients.
The epidemiology of childhood AIH is unknown, but type 1 AIH accounts for two-thirds of the cases and presents usually during adolescence, while type 2 AIH presents at a younger age and also during infancy.
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Mieli-Vergani, G., Vergani, D. (2012). When and How to Treat the Pediatric Patient. In: Hirschfield, G., Heathcote, E. (eds) Autoimmune Hepatitis. Clinical Gastroenterology. Springer, New York, NY. https://doi.org/10.1007/978-1-60761-569-9_7
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