Cerebrovascular Disease: Ischemic Stroke, Intracerebral Hemorrhage and Subarachnoid Hemorrhage

1. Risk factor or vascular lesion
Hypertension, diabetes, smoking, dyslipidemia, cardiac embolic disease, atherosclerosis, aneurysm or vascular malformation.

↓

2. Cerebral circulation is disrupted
Arterial occlusion → reduced perfusion and ischemia   |   Vessel rupture → intracerebral or subarachnoid bleeding.

↓

3. Brain tissue undergoes structural injury
Ischemia → ATP failure → neuronal injury → liquefactive infarction. Hemorrhage → tissue disruption + edema + mass effect.

↓

4. Neurological presentation reflects lesion location
Cortical or subcortical infarction produces vascular-territory deficits; posterior circulation injury produces brainstem/cerebellar features; SAH prominently produces sudden severe headache and meningism.

↓

5. Imaging identifies the pathological pattern
Ischemia → early loss of gray-white differentiation or restricted diffusion; ICH → hyperdense intraparenchymal blood; SAH → blood in cisterns, fissures or sulci.

↓

6. Intervention targets the structural threat
Severe edema → decompression; selected hematoma → evacuation; hydrocephalus → CSF diversion; ruptured aneurysm → clipping or endovascular occlusion.

↓

7. Prevention and rehabilitation reduce long-term burden
Risk-factor control reduces future vascular events → multidisciplinary rehabilitation reduces disability and improves independence.

Stroke pattern → vascular localization

Face/arm deficit greater than leg ± aphasia

Lateral cerebral hemisphere dysfunction

Middle cerebral artery territory

Vertigo + dysarthria + dysphagia + ataxia

Brainstem/cerebellar dysfunction → vertebrobasilar circulation

SAH → recognition and secondary injury

Ruptured intracranial aneurysm

Blood enters subarachnoid space

Sudden severe headache + meningeal irritation

Subarachnoid blood

Vasospasm or impaired CSF flow → delayed ischemia or hydrocephalus

Imaging → neurosurgical objective

Large lesion + edema + tissue shift

Dangerous mass effect → consider decompression or hematoma evacuation

Ventricular enlargement after hemorrhage

Hydrocephalus → CSF diversion when indicated

⭐ Reduced cerebral perfusion → ATP depletion and neuronal injury → prolonged ischemia produces liquefactive cerebral infarction.

Vascular territory → specific brain structure affected → characteristic neurological deficit, allowing clinical localization before imaging confirmation.

⭐ Deep intracerebral bleeding is strongly linked with chronic small-vessel injury; the resulting hematoma + edema can produce dangerous mass effect.

Acute CT pattern helps separate disease processes: intraparenchymal hyperdensity suggests ICH, while blood in cisterns and sulci supports SAH.

⭐ Ruptured saccular aneurysm → subarachnoid blood → severe headache and meningism → risk of rebleeding, vasospasm and hydrocephalus.

Neurosurgical treatment follows the structural problem: mass effect → decompression/evacuation; hydrocephalus → CSF diversion; aneurysm → vascular exclusion.

Hypertension, diabetes, smoking and dyslipidemia → vascular injury and stroke burden → risk-factor control reduces preventable cerebrovascular disease.

⭐ Established neurological disability → physiotherapy, occupational therapy, communication/swallowing support and psychosocial rehabilitation → greater functional independence.