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Related Concept Videos

Transient Ischemic Attack l: Introduction01:26

Transient Ischemic Attack l: Introduction

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...
Ischemic Stroke l: Introduction01:15

Ischemic Stroke l: Introduction

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.
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...
Stroke: Introduction and Types01:29

Stroke: Introduction and Types

A stroke is an acute neurological event caused by the sudden disruption of cerebral blood flow, leading to rapid loss of neuronal function. Neurons depend on continuous oxygen and glucose supply, so even brief interruptions can cause irreversible injury within minutes. Strokes are classified into ischemic and hemorrhagic types.Ischemic StrokeIschemic strokes are most common and occur due to arterial occlusion, depriving brain tissue of oxygen and nutrients. This leads to energy failure, ionic...
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...

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Brain Infarct Segmentation and Registration on MRI or CT for Lesion-symptom Mapping
10:25

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Published on: September 25, 2019

Lesions masquerading as acute stroke.

Xiang Liu1, Jeevak Almast, Sven Ekholm

  • 1Division of Diagnostic & Interventional Neuroradiology, Department of Imaging Sciences, University of Rochester Medical Center, Rochester, New York 14642-8638, USA.

Journal of Magnetic Resonance Imaging : JMRI
|December 21, 2012
PubMed
Summary
This summary is machine-generated.

Recognizing stroke mimics is crucial to avoid incorrect therapies and delayed treatment. This review classifies stroke mimics based on neuroimaging findings to aid diagnosis.

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Area of Science:

  • Neuroradiology
  • Neurology
  • Emergency Medicine

Background:

  • Accurate diagnosis of acute stroke is critical to prevent unnecessary interventions and treatment delays.
  • Stroke mimics, conditions presenting with stroke-like symptoms but not actual stroke, pose a diagnostic challenge.

Purpose of the Study:

  • To classify lesions that mimic acute stroke based on neuroradiological findings.
  • To provide a diagnostic algorithm for differentiating stroke mimics from true acute stroke.

Main Methods:

  • Review of neuroimaging findings for lesions mimicking acute stroke.
  • Classification of mimics into three groups: normal imaging, symptom mimics, and symptom and imaging mimics.
  • Development of a diagnostic algorithm.

Main Results:

  • Lesions mimicking stroke were categorized based on imaging characteristics.
  • Focus on symptom and imaging mimics with stroke-like findings.
  • A diagnostic algorithm was proposed for clinical application.

Conclusions:

  • Effective differentiation of stroke mimics from acute stroke is essential for patient management.
  • The proposed classification and algorithm can guide neuroradiologists in diagnosing stroke mimics.
  • Improved diagnostic accuracy for stroke mimics leads to better patient outcomes.