Isolated angiitis of the central nervous system (IACNS) is a rare form
of vasculitis restricted to the CNS. We report-serial MRI findings in
a biopsy-proven case of IACNS. MRI showed extensive white matter and
subcortical disease. Before specific treatment; neuroimaging showed th
e development-of new lesions corresponding with an overall progressive
clinical course of the illness; the post-treatment MRI showed improve
ment.