_:vb50940741 . _:vb50940741 . "megalencephalic leukoencephalopathy with subcortical cysts 2B, remitting, with or without mental retardation"^^ . . _:vb50940741 . . "disease_ontology"^^ . "OMIM:613926"^^ . . "A megalencephalic leukoencephalopathy with subcortical cysts characterized by infantile-onset macrocephaly and mildly delayed motor development associated with white matter abnormalities that improve with age, and sometimes mental retardation that has_material_basis_in heterozygous mutation in HEPACAM on chromosome 11q24."^^ . _:vb50940741 . _:vb50940741 . "megalencephalic leukoencephalopathy with subcortical cysts 2B"@en . "DOID:0080317"^^ . .