Abstract
Prader–Willi syndrome (PWS) is a rare genetic disorder caused by deletion or unexpression of the chromosome 15 (q 11-13). Symptomatologies include hypotonia, hyperphagia, cognitive impairment, and characteristic dysmorphic profile. Here, we report a 4-year-old boy with PWS who presented with complications of congenital hepatic fibrosis. The uniparental heterodisomy makes it unlikely that the hepatic fibrosis was caused by unmasking of a recessive mutation on the maternal chromosome 15 although we cannot exclude the possibility of a recessively inherited mutation elsewhere given the parental consanguinity. This is the first report of congenital hepatic fibrosis in PWS.