Insular epilepsy masquerading as multifocal cortical epilepsy as proven by depth electrode

Area of Science:

• Neuroscience
• Epileptology
• Neurosurgery

Background:

• The insular cortex is an infrequent site for epilepsy, often presenting diagnostic challenges.
• Seizures originating in the insula can mimic symptoms of epilepsy in other brain regions like the temporal or parietal lobes.
• Standard diagnostic tools like electroencephalography (EEG) and surface electrocorticography (ECoG) may inaccurately pinpoint seizure foci in insular epilepsy.

Observation:

• A case study involving a young female patient with complex partial seizures is presented.
• Initial diagnostic evaluations suggested seizure foci in cortical areas other than the insula.
• The patient's seizures were ultimately traced to the insular cortex through the use of specialized insular depth electrodes.

Findings:

• Depth electrode recordings provided accurate localization of the epileptogenic zone within the insula.
• Surgical resection of the identified insular focus resulted in effective seizure control for the patient.
• This case highlights the limitations of conventional methods in diagnosing insular epilepsy.

Implications:

• Insular depth electrode placement is crucial for precise localization in suspected insular epilepsy.
• Accurate localization is essential for effective treatment strategies, including surgical intervention.
• Understanding insular epilepsy semiology can improve diagnostic accuracy and patient outcomes.