Volume 55, Issue 2 pp. 264-277
Full-Length Original Research

Frontal lobe seizures: From clinical semiology to localization

Francesca Bonini

Francesca Bonini

INSERM UMR 1106, Institut de Neurosciences des Systèmes, Marseille, France

Faculty of Medicine, Aix-Marseille University, Marseille, France

These authors equally contributed to this study.Search for more papers by this author
Aileen McGonigal

Aileen McGonigal

INSERM UMR 1106, Institut de Neurosciences des Systèmes, Marseille, France

Faculty of Medicine, Aix-Marseille University, Marseille, France

Clinical Neurophysiology Department, Timone Hospital, Assistance Publique des Hôpitaux de Marseille, Marseille, France

These authors equally contributed to this study.Search for more papers by this author
Agnès Trébuchon

Agnès Trébuchon

INSERM UMR 1106, Institut de Neurosciences des Systèmes, Marseille, France

Faculty of Medicine, Aix-Marseille University, Marseille, France

Clinical Neurophysiology Department, Timone Hospital, Assistance Publique des Hôpitaux de Marseille, Marseille, France

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Martine Gavaret

Martine Gavaret

INSERM UMR 1106, Institut de Neurosciences des Systèmes, Marseille, France

Faculty of Medicine, Aix-Marseille University, Marseille, France

Clinical Neurophysiology Department, Timone Hospital, Assistance Publique des Hôpitaux de Marseille, Marseille, France

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Fabrice Bartolomei

Fabrice Bartolomei

INSERM UMR 1106, Institut de Neurosciences des Systèmes, Marseille, France

Faculty of Medicine, Aix-Marseille University, Marseille, France

Clinical Neurophysiology Department, Timone Hospital, Assistance Publique des Hôpitaux de Marseille, Marseille, France

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Bernard Giusiano

Bernard Giusiano

INSERM UMR 1106, Institut de Neurosciences des Systèmes, Marseille, France

Faculty of Medicine, Aix-Marseille University, Marseille, France

Division of Public Health, Assistance Publique des Hôpitaux de Marseille, Marseille, France

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Patrick Chauvel

Corresponding Author

Patrick Chauvel

INSERM UMR 1106, Institut de Neurosciences des Systèmes, Marseille, France

Faculty of Medicine, Aix-Marseille University, Marseille, France

Clinical Neurophysiology Department, Timone Hospital, Assistance Publique des Hôpitaux de Marseille, Marseille, France

Address correspondence to Patrick Chauvel, Faculty of Medicine, UMR 1106 INSERM, Institut de Neurosciences des Systèmes, Aix-Marseille University, 27 Bd Jean Moulin, Marseille Cedex 05 13385, France. E-mail: [email protected]Search for more papers by this author
First published: 24 December 2013
Citations: 220

Summary

Objective

Frontal lobe seizures are difficult to characterize according to semiologic and electrical features. We wished to establish whether different semiologic subgroups can be identified and whether these relate to anatomic organization.

Methods

We assessed all seizures from 54 patients with frontal lobe epilepsy that were explored with stereoelectroencephalography (SEEG) during presurgical evaluation. Semiologic features and concomitant intracerebral EEG changes were documented and quantified. These variables were examined using Principal Component Analysis and Cluster Analysis, and semiologic features correlated with anatomic localization.

Results

Four main groups of patients were identified according to semiologic features, and correlated with specific patterns of anatomic seizure localization. Group 1 was characterized clinically by elementary motor signs and involved precentral and premotor regions. Group 2 was characterized by a combination of elementary motor signs and nonintegrated gestural motor behavior, and involved both premotor and prefrontal regions. Group 3 was characterized by integrated gestural motor behavior with distal stereotypies and involved anterior lateral and medial prefrontal regions. Group 4 was characterized by seizures with fearful behavior and involved the paralimbic system (ventromedial prefrontal cortex ± anterior temporal structures). The groups were organized along a rostrocaudal axis, representing bands within a spectrum rather than rigid categories. The more anterior the seizure organization, the more likely was the occurrence of integrated behavior during seizures. Distal stereotypies were associated with the most anterior prefrontal localizations, whereas proximal stereotypies occurred in more posterior prefrontal regions.

Significance

Meaningful categorization of frontal seizures in terms of semiology is possible and correlates with anatomic organization along a rostrocaudal axis, in keeping with current hypotheses of frontal lobe hierarchical organization. The proposed electroclinical categorization offers pointers as to the likely zone of organization of networks underlying semiologic production, thus aiding presurgical localization. Furthermore, analysis of ictal motor behavior in prefrontal seizures, including stereotypies, leads to deciphering the cortico-subcortical networks that produce such behaviors.

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