Thought you might be interested in this
Hi.
It should be understood that while the target of the surgery is to remove the tumor, some normal brain tissues surrounding the tumor may have also been removed or affected during the surgery. Your sister's present symptoms may represent what is called a 'frontal lobe syndrome'. This syndrome manifests with personality changes, severe mood swings and sometimes be mistaken as a psychiatric condition (such as that of hallucinations).
Controlling the brain swelling after the surgery may be the key to recovery. This can be done through use of steroids or osmotic diuretics. I suggest you discuss these options with her doctors.
Regards and God bless.