MTHFR and mucolipidosis type III, alpha/beta: Other cases include late-diagnosed α Mannosidosis, GM2 [26], Mucopolysaccharidosis type IIIA [27], MTHFR [28], MPS I [29], Mucolipidosis type III, Hawkinsuria, Cerebrotendinomatous xanthomatosis, or Congenital Glycosylation Defect Type I.