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Second-impact syndrome occurs when the brain swells rapidly, and catastrophically, after a person has a second concussion before symptoms from an earlier one have subsided.
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Second-impact syndrome occurs when the brain swells rapidly, and catastrophically, after a person has a second concussion before symptoms from an earlier one have subsided.
Wikipedia
A rare, deadly condition in which the brain swells as the result of a concussion received before symptoms from another concussion have gone away
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