MRI reveals structural abnormalities in patients with idiopathic generalized epilepsy

Area of Science:

• Neurology
• Radiology
• Epileptology

Background:

• Idiopathic generalized epilepsies (IGEs) are a group of epilepsy syndromes with genetic origins.
• Accurate diagnosis relies on clinical presentation, electroencephalography (EEG), and neuroimaging.
• Magnetic Resonance Imaging (MRI) is a key tool for evaluating brain structure in epilepsy.

Purpose of the Study:

• To assess the prevalence and nature of MRI findings in a large cohort of patients diagnosed with IGEs.
• To correlate MRI abnormalities with clinical and EEG characteristics in IGE patients.

Main Methods:

• 134 patients with IGEs, diagnosed per International League Against Epilepsy criteria, underwent 2.0 T MRI using an established epilepsy protocol.
• MRI scans were reviewed for abnormalities, and patients were categorized into those with and without findings.
• Statistical comparisons were made between groups regarding demographics, seizure history, EEG data, and treatment outcomes.

Main Results:

• Twenty-four percent (33 of 134) of MRIs demonstrated abnormalities, predominantly nonspecific in nature (88%).
• Common abnormalities included arachnoid cysts, cortical atrophy, basal ganglia changes, ventricular enlargement, white matter alterations, reduced hippocampal volume, focal cortical dysplasia, and frontal gliosis.
• Patients with abnormal MRI findings were more likely to exhibit EEG focalities, often concordant with the MRI lesion location.

Conclusions:

• MRI reveals abnormalities in approximately a quarter of patients with IGEs.
• The majority of these MRI findings are nonspecific, highlighting the need for careful interpretation in the context of clinical and EEG data.