An autosomal recessive inherited congenital muscular dystrophy caused by mutations in the POMT2 gene. It is characterized by mental retardation and mild structural brain abnormalities resulting from defective glycosylation of alpha-dystroglycan. The disease is muscular dystrophy-dystroglycanopathy (congenital with intellectual disability), type B2 (MONDO_0013160, a Monarch Disease Ontology id). Also known as: congenital muscular dystrophy-POMT2 related, congenital muscular dystrophy-dystroglycanopathy with intellectual disability type B2, congenital muscular dystrophy-dystroglycanopathy with mental retardation type B2.