NCIt definition : A genetic condition usually inherited in an autosomal dominant pattern. It is cause
by mutation(s) in the IFIH1 gene, encoding interferon-induced helicase C domain-containing
protein 1. Clinical features and onset may vary significantly, but is characterized
in its most severe form by cerebral atrophy, leukodystrophy, intracranial calcifications,
chronic cerebrospinal fluid (CSF) lymphocytosis, and increased concentrations of CSF
alpha-interferon.;