Figure 2. Herpes simplex encephalitis. (a) T₂ weighted axial image shows abnormal increased signal intensities in both temporal lobes involving gray and white matter. These are hypointense on (b) T₁ weighted image and mildly hyperintense on (c) T₁ weighted magnetization transfer (MT) image. No abnormal meninges are seen on pre-contrast images. (d) Post-contrast T₁ weighted MT image shows abnormal meningeal enhancement in both hemispheres along with left ependymal enhancement.