A fairly defined left cerebellopontine angle isodense mass lesion is seen. It shows homogenous enhancement in post-contrast study. It is surrounded by significant low attenuation vasogenic edema. Both the mass and surrounding edema exert mass effect in the form of compression of the 4th ventricle & compression of the nearby brain stem and vital structures. Consequent supratentorial hydrocephalus is seen with periventricular transependymal CSF permeation a type of cerebral oedema.
The current CT findings are impressive of left cerebellopontine angle extra-axial large SOL likely meningioma.