Standard Stroke Classifications
1. By Type (Etiology)
Ischemic Stroke (≈85%)

Thrombotic (large/small vessel disease)

Embolic (often cardiac source, e.g. AF)

Cryptogenic

Hemorrhagic Stroke (≈15%)

Intracerebral hemorrhage

Subarachnoid hemorrhage

2. By TOAST Classification (used in ischemic stroke)
Large-artery atherosclerosis

Cardioembolism

Small-vessel occlusion

Stroke of other determined etiology

Stroke of undetermined etiology

3. By Clinical-Radiological Criteria
Location: anterior vs. posterior circulation

Severity: NIHSS score

Imaging: infarct core vs. penumbra (DWI/CT perfusion)