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Pain into the right shoulder and to the neck and head wouldn't be from a head/brain issue.
Nor would it be from a shoulder issue.
This sounds like a cervical spine issue:
So asking for MRI of the cervical spine would be more useful here.
Did you get a MRI of the cervical spine (neck) here? If not, that's the MRI you should get. The MRI of the brain isn't helpful here.
It could be a trapped nerve in the mid cervical spine, as that could cause pain to travel up the back of the head as well as into the shoulder.
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