Correlation of Electroencephalography and Magnetic Resonance Imaging in Patients with Mesial Temporal Sclerosis

To determine the lateralization of lesion by non-invasive methods through correlation of cranial magnetic resonance imaging (MRI) and electroencephalography (EEG) findings in patients with mesial temporal sclerosis (MTS).

This study included 40 patients (Age range, 19 to 55 years) among 1850 patients who were attending outpatient epilepsy clinic of Haydarpaşa Numune Hospital between the years 2000 and 2013. Exclusion criteria were surgery due to MTS, metabolic and systemic disorders, indefinite diagnosis, and inadequate MRI and EEG evaluations.

EEG findings were within normal limits in 10 (25%) patients who had MTS on MRI. Of these, 5 patients had right MTS, 4 had left MTS, and one patient had bilateral MTS.

In this study, we used electrophysiological diagnostic methods together with MR imaging to determine epileptogenic localization in patients with MTS. We suggest that, when correlated with MRI, EEG is a non-invasive and easy method to identify lateralization findings.