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Related Concept Videos

Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

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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...
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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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Transient Ischemic Attack l: Introduction01:26

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A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
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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...
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Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
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Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
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Reversible Cerebral Vasoconstriction Syndrome, Part 1: Epidemiology, Pathogenesis, and Clinical Course.

T R Miller1, R Shivashankar1, M Mossa-Basha2

  • 1From the Department of Diagnostic Radiology (T.R.M., R.S., D.G.), Section of Neuroradiology, University of Maryland Medical Center, Baltimore, Maryland.

AJNR. American Journal of Neuroradiology
|January 17, 2015
PubMed
Summary
This summary is machine-generated.

Reversible cerebral vasoconstriction syndrome (RCVS) causes sudden, severe headaches due to temporary narrowing of brain arteries. While usually resolving, RCVS can lead to stroke or bleeding in rare cases.

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Area of Science:

  • Neurology
  • Vascular Neurology
  • Radiology

Background:

  • Reversible cerebral vasoconstriction syndrome (RCVS) is a clinical and radiologic syndrome presenting as a common manifestation of various underlying disorders.
  • It is characterized by sudden, severe thunderclap headaches and reversible narrowing of cerebral arteries.
  • Triggers can be spontaneous or exogenous, with unknown pathophysiology but suspected alterations in cerebral vascular tone.

Purpose of the Study:

  • To provide a comprehensive overview of Reversible Cerebral Vasoconstriction Syndrome.
  • To elucidate the clinical and radiological characteristics of RCVS.
  • To discuss the potential underlying mechanisms and clinical outcomes of RCVS.

Main Methods:

  • Review of clinical and radiological findings associated with Reversible Cerebral Vasoconstriction Syndrome.
  • Analysis of reported cases and literature concerning the presentation, triggers, and pathophysiology of RCVS.
  • Discussion of diagnostic criteria and management strategies for RCVS.

Main Results:

  • RCVS is defined by thunderclap headache and reversible vasoconstriction of cerebral arteries.
  • The syndrome can be spontaneous or triggered by external factors.
  • While typically benign, RCVS carries a risk of severe complications like ischemic stroke or intracranial hemorrhage.

Conclusions:

  • Reversible Cerebral Vasoconstriction Syndrome is a distinct neurological entity with characteristic clinical and imaging features.
  • Understanding the diverse etiologies and potential complications is crucial for patient management.
  • Further research into the pathophysiology of RCVS is warranted to improve treatment strategies and outcomes.