second impact syndrome

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Alternative forms[edit]


second impact syndrome (usually uncountable, plural second impact syndromes)

  1. A rapid and severe brain swelling caused by a second concussion before a first has sufficiently healed, such as may occur after suffering two concussions during the same sports match. It has catastrophic results and may cause death or permanent disability.


  • SIS (abbreviation)

Coordinate terms[edit]

Derived terms[edit]

  • SIS (abbreviation)