NCIt definition : A genetic condition usually inherited in an autosomal recessive pattern. It is cause
by mutation(s) in the SAMHD1 gene, encoding deoxynucleoside triphosphate triphosphohydrolase
SAMHD1. 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.;