B4GALT1-congenital disorder of glycosylation (MONDO_0011772) can be described as follows. B4GALT1-CDG is a congenital disorder of glycosylation characterized by macrocephaly due to Dandy-Walker malformation, hydrocephaly, hypotonia, myopathy and coagulation anomalies. To date, only one case has been reported. The syndrome is associated with mutations in the GALT1 gene (localized to region q13 of chromosome 9) leading to a deficiency in the Golgi apparatus enzyme beta-1,4-galactosyl transferase. Also known as: B4GALT1-CDG, Beta-1,4-galactosyltransferase deficiency, CDG syndrome type IId, CDG-IId, CDG2D, carbohydrate deficient glycoprotein syndrome type IId, congenital disorder of glycosylation type 2d, congenital disorder of glycosylation type IId.