Thank you very much for your question; although it is quite difficult for me to give you a precise opinion here without being able to examine him & seeing his investigation reports, but I would try to provide you some relevant information about his health concern.
It appears that high calcium deposits in brain could be due to hormonal imbalance (eg. pseudohypoparathyriodism), high calcium/vitamin D intake and improper healing of fractured bone in brain. This may result into symptoms of severe headache, cognitive impairment, dementia, and depression as well. If he suffers continuous headache, please arrange an appointment with a neurologist right away who will evaluate the possibilities here and can provide you further treatment. Hope this information proves helpful to you.
Take Care & Regards!!!
Fahr's disease is symmetrical and bilateral. If not, that is good news. Paula428