Case 4

This is an MRI brain study showing marked global dilatation of the intracranial ventricles indicating hydrocephalus. This is communicating or non-obstructive hydrocephalus as there is no evidence of obstruction to CSF flow. There is expansion of the sella turcica which is filed with CSF, as a result of high CSF pressure.

There is an extra-axial lesion within the right cerebello-pontine angle, which shows high signal intensity on the T2 weighted series and intermediate intensity on the T1 weighted series, with avid enhancement on the post gadolinium series. The lesion insinuates into the right internal auditory meatus and expands it. This lesion is characteristic of an acoustic neuroma / vestibular schwannoma.

However, the lesion does not exert mass effect on the adjacent brainstem and there is no effacement of the 4^th ventricle.

I would contact the referring physician and recommend neurosurgical referral.