A rare, biliary tract disease characterized by progressive obliterative cholangiopathy of the intra- and extrahepatic bile ducts, occurring in the embryonic/ perinatal period, leading to severe and persistent neonatal jaundice and acholic stool. The disease is Monarch Disease Ontology term MONDO_0008867 (biliary atresia). Also known as: atresia of bile duct, atresia of bile ducts, biliary atresia, congenital, congenital biliary atresia, isolated atresia of bile ducts, non-syndromic biliary atresia.