The calcified granulomas
are not producing any increase in the pressure in the head or edema and therefore is not the cause of your father's headache. Such granulomas are sometimes found on MRIs. Dead worm (cysticerus) or healed tuberculomas are the main causes.
You should get your father examined by a doctor. He may decide to treat him with medicines like analgesics for symptomatic relief or to investigate further for the cause of headache.