Fig. 1.

Brain MRI Findings A-C: At 6 months after initial presentation, axial T2-weighted images (T2WI) and coronal fluid-attenuated inversion recovery (FLAIR) images show multiple hyperintense lesions in the left middle cerebellar peduncle (MCP, open arrow), left cerebellar hemisphere (closed arrow), and brain stem. D-F: Two months later, axial T2WI, axial and coronal FLAIR images reveal extension of the hyperintense lesions in the left MCP (open arrow) and mild cortical atrophy in the left cerebellar hemisphere (closed arrow). G-I: Nine months later, axial T2WI and coronal FLAIR images demonstrate a new hyperintense lesion in the right MCP (open arrow) and loss of cerebellar volume with enlargement of the fourth ventricule. Axial FIALR image shows the progression of cerebellar atrophy (closed arrows).