MRI - MRI brain
Axial T1
Axial T2
Axial FLAIR
Axial DWI
Axial ADC
Coronal T2
Large extra-axial posterior fossa mass lesion epicentered upon the left cerebellopontine angle with an irregular outline. It elicits a low signal on T1WI, a high signal on T2WI and a heterogeneous/dirty signal on FLAIR, high signal on diffusion-weighted sequence (due to a combination of true restricted diffusion and T2 shine through) and low signal on ADC map.
It exerts marked mass effect displacing the brainstem to the right and compressing the fourth ventricle with consequent moderate supratentorial hydrocephalic changes, which are seen as moderately dilated third and lateral ventricles with CSF permeation around both lateral ventricles. The lesion also compresses the left cerebellar hemisphere.