Fig. 1.

Magnetic resonance imaging of the neuraxis. A. Axial T2-weighted image showing hydrocephalus and transependymal flow. B. Representative T2-weighted axial images showing hyperintensity in bilateral insula, frontal lobes, posterior limbs of the internal capsules and thalami, extending inferiorly into the midbrain, pons, cerebellar peduncles, and medial cerebellar hemispheres. C. T1-weighted, contrast-enhanced images showing diffuse leptomeningeal enhancement and thickening within the basilar cisterns and upper cervical canal, pineal region and fourth ventricle. D. T1-weighted, contrast-enhanced sagittal scan of the thoracolumbar region showing diffuse leptomeningeal enhancement in the thecal sac.