Doctors say blows to the head can be silent killers for which swift diagnosis is often the only recourse. Even if there is no damage to the outside of the head, the impact may inflict catastrophic damage to the brain inside, they say. Because a shock that smashes the brain, a 1.3-kilo (2.8-pound) organ with the consistency of soft jelly, against the hard protective shell of the skull, can damage nerves, brain cells and blood vessels. Blood ...
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