Innumerable, irregular, peripherally contrast enhancing lesions are seen in the supra and infratentorial brain, of varying sizes. These are mostly distributed in the basal ganglia and at the grey-white matter junction. The largest are located in the parietal lobes, measuring up to 4.5 cm on the right and 2.7 cm on the left. Several of lesions have a mural nodule e.g. in the right basal ganglia, and the left frontal lobe lesion has a target-like pattern of enhancement. No convincing central diffusion restriction. Many are however T2 hypointense centrally, with foci of susceptibility. Extensive surrounding vasogenic oedema. No definite leptomeningeal or pachymeningeal thickening/hyperenhancement.
No ventricular enlargement or ependymal enhancement to suggest ventriculitis. No subfalcine, uncal or tonsillar herniation. Paranasal sinuses are unremarkable.