MRI of the brain confirms the presence of a large mass expanding the pons. It is T1W hypointense and T2W hyperintense, with areas on the left which demonstrate fluid signal intensity and mostly attenuated on FLAIR. These areas also demonstrate peripheral irregular contrast enhancement. The mass overall does not demonstrate restricted diffusion, nor are there convincing areas of calcification or haemorrhage on gradient echo.
The fourth ventricle is effaced and hydrocephalus is present.