1. For patients diagnosed with a presumptive TIA, it is relatively common to have infarction demonstrated on DWMRI within the first 24 hours (~33% overall and 30-50% for any time epic within the first 24 hrs).
2. Based on a Scientific Statement issued by the American Stroke Association in 2009, a Transient Ischemic attack (TIA) is best defined as a transient episode of neurological dysfunction caused by focal brain, spinal cord, or retinal ischemia, without acute infarction (Easton JD et al. Stroke 2009;40:2276-2293). Importantly, no symptom duration limitation is specified in this revised definition.
3. Pure sensory syndromes involving the contralateral face, arm, and/or leg have been described in both ischemic and hemorrhagic thalamic stroke, but these are relatively uncommon and the prevalence of TIAs isolated to the thalamus is unclear.