Investigation for a cerebellopontine angle mass is part of the daily work of most radiology departments typically for sensioneural hearing loss.

The commonest pathology at this site is a vestibular schwammona.   One key differential is a meningioma, which although not pathognomonic, characteristically exhibits a dural tail.

In this case the patients symptoms were infact trigeminal neuralgia due to impingement of the 5th cranial nerve against the brainstem.