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Seizures: Classification

Seizures: Classification

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.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:

Seizures l: Introduction

Seizures l: Introduction

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,...

Epilepsy and Seizures: Overview

Epilepsy and Seizures: Overview

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...

Seizures ll: Types

Seizures ll: Types

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...

Brain Imaging

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans), magnetic resonance imaging (MRI), functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).

Aneurysm II: Clinical Manifestations and Diagnostic Studies

Aneurysm II: Clinical Manifestations and Diagnostic Studies

Thoracic, aortic arch and abdominal aneurysms are significant vascular conditions that can present with various clinical manifestations and lead to serious complications. Understanding these manifestations and the appropriate diagnostic studies is essential for effective management and treatment.Thoracic Aortic AneurysmsThoracic aortic aneurysms often remain asymptomatic until they reach a size that impinges on adjacent structures. They typically cause deep, diffuse chest pain that radiates to...

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Related Experiment Video

Updated: Jun 7, 2026

Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy

Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy

Published on: September 20, 2024

Seizures: emergency neuroimaging.

Christopher P Hess¹, A James Barkovich

¹UCSF Department of Radiology & Biomedical Imaging, 505 Parnassus Avenue, Room L-358, San Francisco, CA 94143-0628, USA. christopher.hess@ucsf.edu

Neuroimaging Clinics of North America

|October 27, 2010

Summary

This summary is machine-generated.

Computed tomography (CT) and magnetic resonance (MR) imaging reveal diverse causes of seizures. Radiologists use these neuroimaging techniques to identify acute abnormalities and causes of recurrent seizures, guiding prompt intervention to prevent brain injury.

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Brain Source Imaging in Preclinical Rat Models of Focal Epilepsy using High-Resolution EEG Recordings

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Last Updated: Jun 7, 2026

Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy

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Brain Source Imaging in Preclinical Rat Models of Focal Epilepsy using High-Resolution EEG Recordings

Brain Source Imaging in Preclinical Rat Models of Focal Epilepsy using High-Resolution EEG Recordings

Published on: June 6, 2015

Area of Science:

Neurology
Radiology
Medical Imaging

Background:

Seizures are a common neurologic symptom with varied underlying causes.
Computed tomography (CT) and magnetic resonance (MR) imaging are crucial diagnostic tools.
Understanding neuroanatomy and seizure classification is essential for accurate interpretation.

Purpose of the Study:

To correlate neuroimaging findings with clinical presentations of seizure causes.
To highlight the roles of CT and MR imaging in evaluating patients with seizures.
To aid radiologists in diagnosing common and uncommon causes of seizures and epilepsy.

Main Methods:

Review of clinical features and neuroimaging findings associated with seizures.
Focus on differential diagnosis based on clinical presentation and imaging characteristics.
Emphasis on recognizing findings in recurrent seizures and reversible causes.

Main Results:

CT is valuable for identifying acute abnormalities requiring urgent treatment in emergency settings.
MR imaging is typically used for recurrent or refractory seizures.
Familiarity with imaging manifestations aids in diagnosing various seizure etiologies.

Conclusions:

Accurate interpretation of CT and MR imaging requires knowledge of seizure classification, clinical features, and neuroanatomy.
Radiologists must recognize common findings in recurrent seizures and reversible causes for prompt intervention.
This review provides insights into characteristic imaging findings for different seizure disorders.