Cerebrovascular diseases-2

Cerebrovascular diseases

Cerebrovascular diseases-2

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In previous discussion we have discussed

  1. Brain
  2. Mechanisms of the brain lossing of oxygen
  3. Global Cerebral Ischemia
  4. Focal Cerebral Ischemia/Infarcts
  5. Hemorrhagic (red) infarction
  6. Intracranial hemorrhage
  7. Primary Brain Parenchyma Hemorrhage

So now we will continue our discussion with

Subarachnoid Hemorrhage

  • The most frequent cause

– rupture of a saccular (berry) aneurysm.

  • Other causes

– vascular malformation

– trauma

– rupture of an intracerebral hemorrhage into the ventricular system

– hematologic disturbances

– tumors

Saccular Aneurysms:

  • It was the third causes of brain hemorrhage
  • About 90% of saccular aneurysms occur in the anterior circulation near major arterial branch points
  • Multiple aneurysms exist in 20% to 30% of cases.
  • Rupture can occur at any time/acute increaseed in intracranial pressure
Saccular Aneurysms
Saccular Aneurysms

Causes of saccular aneurysms:

  • Congential factors
  • Arteriosclerosis
  • Infection
  • Trauma
  • The impact of hemodynamic facto

Symptoms of saccular aneurysm:

  • Bleeding and rebleeding
  • Subarachnoid Hemorrhage
  • Intracranial hematoma
  • Localizing symptoms
  • Ischemia
Subarachnoid Hemorrhage
Subarachnoid Hemorrhage

An unruptured saccular aneurysm is a thin-walled outpouching of an artery. At the neck of the aneurysm, the muscular wall and intimal elastic lamina stop short and are absent from the aneurysm sac itself; the sac is made up of thickened hyalinized intima. The adventitia covering the sac is continuous with that of the parent artery. Rupture usually occurs at the apex of the sac with extravasation of blood into the subarachnoid space, the substance of the brain, or both

Morphology of Saccular Aneurysms:

morphology of Saccular Aneurysms

Vascular Malformations:

Four principal types

  • arteriovenous malformations (AVM)
  • cavernous angiomas
  • capillary telangiectasias
  • venous angiomas

To visit all informative Medical related posts on this website click here or go to the home above.

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