CT scans can pick: ...up changes in anatomy but not subtle changes in brain function. It can pick up masses (blood clots, tumors & abscesses) but not swelling unless it's severe. A neurologic exam can tell if he's in a coma. The depth of the coma, his other injuries and the health of his other vital organs all contribute to his prognosis. It's complicated! Please talk with his doctors. Best wishes.
Answered 9/21/2015
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