Figure 2. Case 1. MRI of the posterior fossa. (a) Axial T₂ weighted image and (b) fluid attenuation inversion recovery (FLAIR) images and (c) coronal T₁ weighted image image after infusion of gadolinium demonstrating a swollen right cerebellar hemisphere, hyperintense in T₂ weighted image and FLAIR, distorting the fourth ventricle and exerting mild mass effect over the brainstem. A pial pattern of gadolinium enhancement can be seen.