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Updated: May 9, 2026

Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy
Published on: September 20, 2024
[Epilepsy surgery in children with focal cortical dysplasias]
Francisco J Villarejo-Ortega1, Juan Álvarez-Linera Prado, M Ángeles Pérez-Jiménez
1Hospital Infantil Universitario Nino Jesus, 28009 Madrid, Espana.
Insights
Focal cortical dysplasias (FCD) are a leading cause of pediatric epilepsy surgery. Advances in pre-surgical diagnosis and surgical techniques improve outcomes for children with FCD, even in challenging cases.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Neurosurgery
Background:
- Focal cortical dysplasias (FCD) are the primary cause of medically intractable epilepsy in children requiring surgical intervention.
- Pre-surgical assessment for FCD is challenging due to potential for preserved neurological function and subtle or absent MRI findings.
- Successful surgical outcomes depend on accurate lesion identification and complete resection of dysplastic tissue.
Purpose of the Study:
- To review current literature and expert experience on the pre-surgical assessment and neurosurgical management of pediatric epilepsy due to FCD.
- To discuss FCD classifications, post-surgical prognostic factors, and distinct anatomo-clinical phenotypes in children.
- To explore current challenges and future directions in the surgical treatment of FCD-related epilepsy.
Main Methods:
- Literature review focusing on pre-surgical assessment and neurosurgical management of pediatric FCD.
- Analysis of surgical series data, including FCD classifications and post-surgical outcomes.
- Description of distinct anatomo-clinical phenotypes and their surgical implications.
Main Results:
- Improved pre-surgical diagnostic methods and surgical procedures enable earlier and more successful treatments for FCD.
- Identification of specific anatomo-electro-clinical phenotypes allows for tailored surgical approaches and prognostic expectations.
- Outcomes vary by FCD subtype, with better prognoses for transmantle-type FCD IIb and bottom-of-sulcus dysplasias compared to multilobe FCD I.
Conclusions:
- Advances in diagnosis and surgery are improving outcomes for pediatric epilepsy patients with FCD.
- Tailoring surgical strategies based on identified FCD phenotypes enhances treatment success.
- Further research into FCD classification and management is crucial for optimizing patient care.
Introduction:
Focal cortical dysplasias (FCD) are the first cause of surgery in paediatric epilepsy surgery. The pre-surgical assessment in FCD is often complex, since they are lesions that can be highly epileptogenic and at the same time can preserve neurological functioning and may not be displayed in magnetic resonance imaging. The success of the operation largely depends on the proper identification of the lesion and the possibility of performing a complete resection of the dysplastic tissue. In this work we review the literature related with this topic, in relation to the authors' experience.
Development:
The study reviews some of the advances made as regards the pre-surgical assessment and the neurosurgical management of epilepsy in children with FCD; results from the surgical series regarding the classifications of FCD and the post-surgical prognostic factors are commented on; some anatomo-clinical phenotypes that are distinctive in children with FCD and their surgical management are described; and current challenges and the future of the surgical treatment of epilepsy in FCD are also briefly discussed.
Conclusions:
The advances being made in the methods of pre-surgical diagnosis and surgical procedures are making it possible to offer successful treatment at earlier ages in patients with FCD who were previously considered 'non-lesional' and in patients with localised lesions in the 'eloquent cortex'. The identification of anatomo-electro-clinical phenotypes of FCD makes it possible to establish surgical approaches and post-surgical prognostic expectations that are well suited to each situation, which are better in the transmantle-type FCD IIb and in bottom-of-sulcus dysplasias than in multilobe FCD, which are mostly FCD I.
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