MRI
There is an abnormal, mass-like T2 FLAIR hyperintense signal abnormality involving the vermis and superior left cerebellar hemisphere (partially extending into the left brachium pontis) associated with mass effect upon the fourth ventricle.
Although the mass has high signal on the b=1000 images, it has slightly facilitated diffusion on ADC compared to adjacent normal brain parenchyma (thus T2 shine through).
Scattered foci of T2 FLAIR hyperintensity involving the periventricular and subcortical white matter are non-specific.