FIG 2. Follow-up MR imaging 3 weeks after the initial MR study.

A, T1-weighted image (616/14) shows high signal intensity in both trigeminal nerves (arrows). High signal intensity foci are also seen in the cerebellar sulci (small arrow). Note that hydrocephalus has progressed.

B, FLAIR image (8002/133/2000) shows diffuse leptomeningeal hyperintensity (small arrows). Both trigeminal nerves are thickened and hyperintense (arrows).

C, Contrast-enhanced T1-weighted image (616/14) shows diffuse leptomeningeal enhancement corresponding to the findings of FLAIR imaging.