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Related Concept Videos

Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...
Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
Hemorrhagic Stroke l: Introduction01:17

Hemorrhagic Stroke l: Introduction

A hemorrhagic stroke is an acute neurological event that occurs when a weakened cerebral blood vessel ruptures, allowing blood to accumulate within or around the brain. The sudden release of blood forms a focal hematoma that increases intracranial pressure, displaces neural tissue, and can obstruct cerebrospinal fluid pathways. These effects may be compounded by intraventricular extension of the hemorrhage, cerebral edema, or compression of adjacent structures, all of which contribute to...
Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
Cerebral Edema l: Introduction01:19

Cerebral Edema l: Introduction

Cerebral edema is a pathological increase in brain water content that disrupts intracranial pressure regulation and impairs neurological function. Because the cranial vault is rigid, even modest increases in tissue volume can compromise cerebral perfusion, distort neural structures, and initiate secondary injury. Cerebral edema develops through four principal mechanisms: vasogenic, cytotoxic, interstitial, and ionic.Vasogenic EdemaVasogenic edema arises from disruption of the blood–brain...
Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...

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Updated: May 29, 2026

A Murine Model of Carotid Aneurysm Formation
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Published on: September 9, 2025

Hemodynamic mechanisms underlying cerebral aneurysm pathogenesis.

David L Penn1, Ricardo J Komotar, E Sander Connolly

  • 1Department of Neurological Surgery, Columbia University, New York, NY, USA. DLP628@gmail.com

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia
|September 16, 2011
PubMed
Summary

Intracranial aneurysms can cause subarachnoid hemorrhage (SAH), a dangerous condition leading to brain damage. This study surveys the hemodynamic factors contributing to aneurysm formation and rupture.

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Pre-Chiasmatic, Single Injection of Autologous Blood to Induce Experimental Subarachnoid Hemorrhage in a Rat Model
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Published on: June 18, 2021

Area of Science:

  • Neurology
  • Cardiovascular Research
  • Biomedical Engineering

Background:

  • Intracranial aneurysms and subarachnoid hemorrhage (SAH) are major cerebrovascular diseases causing significant morbidity and mortality.
  • Large aneurysms can compress brain tissue, leading to neurological deficits, but rupture poses the greatest risk, causing SAH.
  • SAH increases the risk of cerebral ischemia due to reduced blood flow and vasospasm.

Purpose of the Study:

  • To provide a comprehensive overview of the hemodynamic pathogenesis of aneurysmal subarachnoid hemorrhage.
  • To detail the interconnected factors contributing to the pathophysiology of intracranial aneurysms and SAH.
  • To synthesize current understanding of hemodynamic forces, vascular remodeling, inflammation, and genetics in aneurysm development.

Main Methods:

  • Literature review and synthesis of existing research on aneurysm formation, development, and rupture.
  • Analysis of the role of hemodynamic forces in the pathogenesis of aneurysmal SAH.
  • Examination of the interplay between vascular remodeling, inflammation, and genetic factors.

Main Results:

  • Hemodynamic forces are critical in the initiation, growth, and rupture of intracranial aneurysms.
  • A complex interplay exists between mechanical stress, cellular responses (remodeling, inflammation), and genetic predispositions.
  • Understanding these factors is key to elucidating the complete pathophysiological cascade leading to SAH.

Conclusions:

  • The hemodynamic pathogenesis of aneurysmal SAH is multifactorial, involving intricate interactions between biomechanical and biological processes.
  • Further research into these interconnected factors is essential for developing effective prevention and treatment strategies.
  • This survey highlights the critical need for a holistic approach to understanding cerebrovascular disorders like aneurysmal SAH.