Magnetic resonance imaging and late-onset epilepsy

Area of Science:

• Neurology
• Radiology
• Epileptology

Background:

• Late-onset epilepsy diagnosis can be challenging.
• The utility of magnetic resonance imaging (MRI) in this patient group remains understudied.
• Computed tomography (CT) scans often provide limited diagnostic information.

Purpose of the Study:

• To prospectively evaluate the diagnostic value of MRI in patients with late-onset epilepsy.
• To compare MRI findings with CT scans in patients with normal, non-diagnostic, or irrelevant CT results.
• To determine if MRI is particularly useful in patients with focal neurological or electroencephalogram (EEG) findings.

Main Methods:

• Prospective evaluation of 50 patients with late-onset epilepsy.
• Clinical assessment, EEG, CT, and MRI were performed.
• Neuroradiologist interpretation of scans was blinded to clinical data.
• Comparison with an age- and sex-matched control group for white matter lesions.

Main Results:

• MRI identified the cause of seizures in 4 of 32 patients (12.5%) with normal CT scans.
• MRI clarified the diagnosis in 5 of 12 patients (41.7%) with non-diagnostic CT scans.
• MRI was diagnostic in 32% of patients with partial seizures and/or focal EEG findings, compared to 0% without focal features (p<0.01).

Conclusions:

• Magnetic resonance imaging (MRI) is a useful diagnostic tool for investigating late-onset epilepsy.
• MRI is particularly beneficial in patients presenting with focal neurological signs or EEG abnormalities.
• The diagnostic yield of MRI in late-onset epilepsy warrants its inclusion in the diagnostic workup.