Idiopathic focal epilepsies: the "lost tribe"

Area of Science:

• Pediatric Neurology
• Epileptology
• Neurodevelopmental Disorders

Background:

• Idiopathic focal epilepsies of childhood (IFE) are common but not formally classified, posing diagnostic and research challenges.
• These syndromes raise key questions about brain networks, comorbidities with neurodevelopmental disorders, and the impact of EEG discharges on cognition.
• While often termed 'benign,' IFEs can cause significant, persistent neuropsychological deficits, representing a public health concern.

Purpose of the Study:

• To review the current understanding of idiopathic focal epilepsies of childhood (IFE), including their phenomenology, genetics, and impact.
• To highlight key research questions and recent discoveries, particularly regarding genetic etiology and neurocognitive outcomes.
• To discuss the need for evidence-based treatment strategies and improved management considering the whole child.

Main Methods:

• Review of clinical symptomatology and courses of recognized IFE syndromes.
• Analysis of recent genetic studies (copy number variation, exome sequencing, linkage) suggesting genetic etiology.
• Discussion of age-related expression, comorbidities, and the role of focal interictal spikes.

Main Results:

• IFE syndromes, including BECTS/RE, Panayiotopoulos, and occipital epilepsies, are common in children.
• Significant progress in identifying genetic underpinnings of IFEs, challenging the 'unknown cause' classification.
• Growing evidence links IFEs to specific, sometimes persistent, neuropsychological deficits, necessitating a re-evaluation of 'benign' classifications and treatment approaches.

Conclusions:

• IFE research is advancing, with a focus on genetic and epigenetic factors, brain network involvement, and neurocognitive consequences.
• There is a critical need for evidence-based treatment guidelines and a holistic approach to managing IFEs, considering cognitive and quality-of-life outcomes.
• International collaborations and working groups are established to further investigate IFE classification, genetics, cognition, and treatment.