<s>[INST] Well last march my brother was diagnosed with brain cancer 10 centimeters on hi left ceribeal lobe which controls his behavior they doc ran 30 radiation treatment he lost his hair and was really confused at times but other times he seemed more normal than some that are in my family??  but His Daughters dont agree he just turned 50 years old he was living with me and he got a stomach virus and so did I  and he was in the hospital because I couldnt take care of him and his daughters wouldnt pick him up so drama my question is why is he so normal at times and then flips and acts totally different? this has been so crazy they said chemotherapy or surgery would cost to much and it wouldnt be worth it so now his daughters have got him in a nursing home saying he is incompitant and they are telling the doctors that they dont want him on his nerve meds I thought the doctor made those decisions I am totally confused so now he is in a nursing home but now he talks like he is fine??? [/INST] Hi, Than for your query. In cerebellar tumor patient may have symptoms like nausea, vomiting, uncoordinated muscular movements, walking difficulties, which may worsen initial few weeks after radiation due to some physiological changes in brain. Later on after 2-3 years patient may have radiation induced late side effects which are irreversible mainly similar to earlier symptoms. But it depends on many factor like dose of radiation and modality of radiation used and dose to surrounding vital structures of brain </s>