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Large destructive skull base meningioma (biopsy proven) demonstrated. The tumour extends into the ethmoid and sphenoid sinuses, left maxillary sinus, nasal cavity, pituitary fossa, left petrous apex and clivus. There is involvement of the left orbital apex with mild proptosis of the left globe and extension into the pterygopalatine fossa. Mass effect on the left mesial temporal lobe and inferior frontal lobe. The mass extends into the prepontine cistern. The tumour encases the intracranial left ICA and extends into the middle cranial fossa . There is extension of the tumour into the suprahyoid aspect of the neck.