There are three major mechanisms of<unk>  in the brain: embolism traveling to the brain, in situ thrombotic occlusion in the intracranial vessels supplying the parenchyma of the brain, and stenosis of vessels leading to poor perfusion secondary to flow-limiting diameter. Globally, the vessel most commonly affected is the middle cerebral artery. Embolisms can originate from multiple parts of the body. Common mechanisms of stroke and<unk> : Stroke mechanism Frequency Pattern of infarcts Number of infarct In situ thrombotic occlusion Uncommon Large subcortical; Sometimes with borderzone; Rarely, whole territory; Sometimes enlarging Single Artery to artery embolism Common Small cortical and subcortical Multiple Impaired clearance of emboli Common Small, scattered, alongside the borderzone region Multiple Branch occlusive disease Common Small subcortical, lacune-like Single Hemodynamic Uncommon Borderzone; May be without lesion Multiple; None
Transient ischemic attack
Seizure
Subarachnoid hemorrhage
Epidural hematoma
Hemiplegic migraine
Ménière's disease  Ménière's disease  1
Watershed stroke
Migraine