Fig. 1. 50-year-old male (patient #3) presented to emergency with ataxia and diplopia. Initial MRI examination reveals a T2 hyperintense lesion in the left front lobe with extension of abnormal signal intensity across midline (A) and enhancement on T1-weighted post-gadolinium images (B). Evaluation of the posterior fossa demonstrates a T2 hyperintense (C) enhancing (D) lesion involving the cerebellar vermis at the fourth ventricle, present at the time of initial examination. MRI, magnetic resonance imaging.
