A large mass is seen centred in the right cerebellopontine angle.
Laterally the mass extends into the porous acousticus/IAC which is remodelled.
Inferiorly, there is moderate expansion of the jugular foramen.
The hypoglossal canal appears intact.
Superiorly the mass appears to extend through the tentorial hiatus.
Moderate mass effect on the pons and right middle cerebellar peduncle.
Post administration of contrast there is largely homogeneous enhancement with minor linear areas of non enhancement.
Large right cerebellopontine angle mass lesion.
Given the where the lesion centred, the involvement of the internal acoustic meatus and symptoms, the lesion most likely represents an acoustic schwannoma.
However, expansion of the jugular foramen is noted, raising the possibility that the lesion represents a schwannoma of the 9-11th cranial nerves.