Hi welcome to Health care magic forum.
Thanks for calling.
As you describe it does n't appear to be concerned with the the brain. May be concerned with the spondylosis
or chest infection
. I advise you to consult a physician for diagnosis and excluding the involvement of the brain.
As he had already two cycles of radiation
he may not be given radiation any more. What ever the problem may be he will be given only conservative treatment only.
Wishing him a quick recovery .