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Related Concept Videos

Epilepsy ll: Types01:22

Epilepsy ll: Types

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.
Seizures l: Introduction01:20

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,...
Seizures: Classification01:13

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:
Epilepsy and Seizures: Overview01:24

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...

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Occipital epilepsy: spatial categorization and surgical management.

Nitin Tandon1, Andreas V Alexopoulos, Ann Warbel

  • 1Department of Neurosurgery, The University of Texas Medical School, Houston, Texas, USA. Nitin.Tandon@uth.tmc.edu

Journal of Neurosurgery
|December 3, 2008
PubMed
Summary

Focal occipital resections for epilepsy are effective, with 81% of patients becoming seizure-free. Lesion location impacts seizure symptoms and visual deficits, but tailored surgery can preserve vision.

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Area of Science:

  • Neurosurgery
  • Epileptology
  • Neuroradiology

Background:

  • Occipital epilepsy is rare, posing challenges in localization and surgical outcomes.
  • Concerns exist regarding visual deficits after occipital resections.
  • Understanding lesion impact on vision and seizure biology is crucial.

Purpose of the Study:

  • To evaluate outcomes of focal occipital resections for epilepsy.
  • To correlate lesion location with seizure semiology and visual deficits.
  • To assess the impact of surgery on seizure control and visual function.

Main Methods:

  • Retrospective study of 21 patients undergoing focal occipital resections.
  • MR imaging used for lesion characterization and spatial categorization (medial, lateral, basal zones).
  • Evaluation of visual function, semiology, and electroencephalography pre- and post-surgery.

Main Results:

  • 81% of patients achieved seizure freedom or occasional auras.
  • Lesion location correlated with visual field defects and seizure aura.
  • 50% of patients had no new visual deficits post-surgery; 34% developed deficits.

Conclusions:

  • Focal occipital resections offer excellent seizure control rates for lesional epilepsy.
  • Surgical tailoring based on lesion location can preserve visual function.
  • Spatial lesion mapping aids in predicting seizure semiology and visual outcomes.