It could be related to the meningioma.
For example an Intraventricular meningioma can block the flow of cerebrospinal fluid , causing symptoms in other locations of the brain.
Do you have all the details of the MRI?
I'm very unsure of the information you read on Olanzapine 2.5 ml (not Clanzpine), which is an antipsychotic drug used to treat schizophrenia and bipolar.
Best wishes,
Niko