Transitory Ischemic Attack (TIA) is a reversible focal neurological deficit lasting minutes to 24 hours. TIAs are harbingers of brain infarction, but only 10% of all strokes are are actually preceded by TIAs. Brain imaging by CT scan or by magnetic resonance scan have detected a brain damage. This permanent cerebral tissue change can be related to dementia because of multiple cerebral infarctions.


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