A brief, self-reversing episode of focal, nonconvulsive neurologic disturbance produced by temporary ischemia. Although TIAs may leave no neurologic deficits, new imaging methods show tissue damage in a number of patients. A TIA is a warning of an imminent stroke; a significant number of individuals who have a TIA will have a stroke (often producing permanent neurologic deficits) within 5 years - and often within a few days.of the TIA.