fig 1.

Images of a 50-year-old man with a 3-month history of progressive dementia, who presented with seizures. Serologic evidence of active neurosyphilis was present, and there was no evidence of herpes virus infection.

A, Axial FLAIR image obtained at midbrain level.

B, Axial FLAIR image obtained at the level of the pons. Asymmetrical bilateral signal hyperintensity in the mesial temporal lobes can be seen and is greater on the right side than on the left.

C, Axial T1-weighted image obtained at the level of the low midbrain. This image shows mild left temporal lobe atrophy, evidenced by dilation of the temporal horn (arrow).