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Related Concept Videos

Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

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Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...
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Seizures l: Introduction01:20

Seizures l: Introduction

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Understanding seizures and epilepsy relies on key definitions that help in recognizing, classifying, and managing these disorders. These definitions provide a framework for recognizing, classifying, and managing seizure disorders.DefinitionsA seizure is a sudden, abnormal burst of electrical activity in the brain that can cause changes in awareness, movement, sensation, or behavior, depending on the area involved. Epilepsy is a chronic condition characterized by recurrent, unprovoked seizures,...
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Epilepsy ll: Types01:22

Epilepsy ll: Types

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Recurrent seizures, stemming from abnormal electrical activity in the brain, are the defining characteristic of epilepsy, a chronic neurological condition. Because seizure features vary greatly, epilepsy is classified using two systems: by seizure type and by epilepsy syndromes. These classifications enable clinicians to describe seizure patterns and select suitable treatment strategies.I. Classification by Seizure Type1. Focal EpilepsyFocal epilepsy begins in one hemisphere of the brain.
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Seizures: Classification01:13

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Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
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Tumor Progression02:07

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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
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Seizures ll: Types01:19

Seizures ll: Types

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Seizures are sudden bursts of abnormal electrical discharge in the brain that interfere with normal function. They are commonly divided into three groups: focal seizures, generalized seizures, and other types that do not fit neatly into either category.Focal SeizuresFocal seizures begin in a single brain region. When awareness is preserved, they are called focal aware seizures and may cause sensations such as tingling, unusual smells, or flashing lights. When awareness is impaired, they are...
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Related Experiment Video

Updated: May 4, 2026

Using a Bipolar Electrode to Create a Temporal Lobe Epilepsy Mouse Model by Electrical Kindling of the Amygdala
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Tumoral epileptogenicity: how does it happen?

Johan Pallud1, Laurent Capelle, Gilles Huberfeld

  • 1Neurosurgery Unit, Sainte-Anne Hospital, Paris, France; Paris Descartes University, Paris, France.

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|December 17, 2013
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Summary

Glioma-related epilepsy stems from tumor interactions with the surrounding brain, particularly the peritumoral neocortex. Altered glutamate and GABA signaling contribute to seizures in brain tumor patients.

Keywords:
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Area of Science:

  • Neuro-oncology
  • Epileptology
  • Molecular Neuroscience

Background:

  • Gliomas are common primary brain tumors frequently associated with seizures.
  • The mechanisms underlying glioma-related epilepsy are complex, involving both tumor biology and neuronal dysfunction.
  • The peritumoral neocortex is identified as a critical region for epileptic activity in glioma patients.

Purpose of the Study:

  • To review the multifactorial mechanisms of glioma-related epilepsy.
  • To explore the roles of glutamatergic and GABAergic signaling in epileptogenesis.
  • To highlight the interplay between tumor growth factors and neuronal excitability.

Main Methods:

  • Review of "tumorocentric" and "epileptocentric" approaches.
  • Analysis of neurotransmitter alterations (glutamate, GABA).
  • Examination of ion homeostasis and cellular interactions in the peritumoral microenvironment.

Main Results:

  • Elevated extracellular glutamate, used by gliomas for growth, contributes to peritumoral hyperexcitability and seizures.
  • Dysregulated GABAergic signaling and altered chloride homeostasis in tumor and neuronal cells promote paradoxical excitation.
  • Changes in extracellular potassium, pH, and gap-junction function further impact local neuronal excitability.

Conclusions:

  • Understanding the intricate relationship between glioma biology and neuronal networks is crucial for developing targeted therapies.
  • Therapeutic strategies must address both oncologic and epileptologic aspects of the disease.
  • Maximal safe surgical resection including the peritumoral neocortex remains a key management approach.