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In page Congenital hepatic fibrosis:

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Embryogenically, congenital hepatic fibrosis is due to malformation of the duct plate, a round structure appearing in the eighth week of gestation that is formed by primitive hepatocytes, which differentiate into cholangiocytes.[1] Congenital hepatic fibrosis usually presents in adolescent or young adulthood, but onset of signs and symptoms can range from early childhood through mid-life. Clinical features may vary but commonly include cholangitis, hepatomegaly and signs of portal hypertension.[citation needed]