Fig. 2

Brain MRI performed 6 days after clinical onset. a-d Axial diffusion weightedimages demonstrate resolution of signal alterations in the parieto-temporal regions, marked enlargement of the lateral and III ventricles (asterisks), and presence of linear restricted diffusion along the ependyma of the lateral ventricles (arrowheads), in keeping with ventricular ependymitis. Axial contrast-enhanced FLAIR (e-h) and T1-weighted (i-j) images show signal alterations at the level of the periventricular white matter (thick arrows), due to increased CSF transependymal reabsorption. Note the diffuse leptomeningeal contrast-enhancement at the level of both cerebral hemispheres associated with marked reduction of the cerebral subarachnoid spaces