Fig. 2

A 28-year-old female patient presented with fever, neck stiffness and altered mental status was diagnosed as viral meningoencephalitis. 1, 2, 3 rows: Axial cuts at same levels. (1) Non-contrast FLAIR images show abnormal high signal intensity at right caudate head (A) and medial aspects of both temporal lobes (B) with faint high signal at perimesencephalic cisterns (C). (2) Post-contrast FLAIR images revealed significant leptomenningeal enhancement (arrows) at both sylvian fissures (D) and perimesencephalic cisterns (E and F) as well as increased brightness of the right caudate head and medial temporal lobes as compared to corresponding pre-contrast images. (3) Post-contrast T1W images where minimal enhancement of perimesencephalic cisterns depicted in H, yet it would be confused with normal vascular enhancement. No significant abnormal enhancement noted in G and I.