This is kind of a hemorrhagic stroke, characterized by the rupture of a blood vessel (caused by an injury or an aneurysm), which then bleeds or hemorrhages. This type of stroke accounts for roughly 20% of all cases, and the root cause is typically found in hypertension or high blood pressure. Needless to say, with proper management of hypertension, the risk can be reduced greatly.
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In this type of stroke, a small blood clot gets lodged in blood vessels connecting to the brain. The clot may have either formed in the brain itself or traveled from elsewhere through the bloodstream. Given the number of tiny blood vessels that connect to the brain, it is not surprising that this type of stroke accounts for nearly 80% of the strokes.
Transient ischemic attack (TIA)
Left MCA Superficial Division
- Right MCA Superficial Divisions – An infarction in this part of the brain can damage the motor cortex, causing the patient to suffer from a left face and arm upper-motor weakness. If the infarct involves the sensory cortex, the patient may also suffer a left face and arm cortical type sensory loss.
- Left MCA Lenticulostriate Branches – An infarction in this part of the brain can damage the basal ganglia and the bend on the internal capsule on the left side, causing right pure upper-motor hemiparesis. There might also be cortical deficits such as speech impairment if the larger infarcts extend to the cortex.
- Right MCA Lenticulostriate Branches – Again, if the infarction causes a damage to the basal ganglia and the bend on the internal capsule on the right side, the patients will suffer from a left pure upper-motor hemiparesis, and speech impairment, if the infarcts are large enough to extend to the cortex.