• Seizure · Oct 2019

    Characteristics of bilateral versus unilateral temporal encephalocele-associated epilepsy.

    • Esther Paule, Thomas M Freiman, Adam Strzelczyk, Philipp S Reif, Laurent M Willems, Marlies Wagner, Johann Philipp Zöllner, and Felix Rosenow.
    • Epilepsy Center Frankfurt Rhine Main and Department of Neurology, Goethe University Frankfurt, Frankfurt, Germany; LOEWE Center for Personalized Translational Research (CePTER), Goethe University Frankfurt, Frankfurt, Germany. Electronic address: esther.paule@kgu.de.
    • Seizure. 2019 Oct 1; 71: 13-19.

    PurposeTo characterise bilateral temporal encephalocele (BTE)-associated epilepsy relative to unilateral temporal encephalocele (UTE)-associated epilepsy as a rare but curable cause of structural epilepsy using demographics, epilepsy status and imaging findings.MethodIn this single-centre retrospective study we included all patients from June 2015 to August 2018, who suffered from epilepsy and were diagnosed with a temporal encephalocele. Data were systematically collected and analysed for differences between BTE and UTE.ResultsSeventeen epilepsy patients diagnosed with temporal encephaloceles (TE) were identified. One-third exhibited BTE. The age of epilepsy onset was higher in patients with BTE compared to UTE (median 51 vs. 37 years, p = 0.074). Latency between epilepsy diagnosis and definitive TE diagnosis differed considerably with a median five-fold shorter duration for the BTE-group when compared to the UTE-group (2-10 years, p = 0.02). Five of seven (81%) patients with BTE were pharmacoresistant, while this applied to only five out of ten (50%) patients with a UTE.ConclusionWhen compared to UTE-associated epilepsy, BTE-associated epilepsy is characterised by a later age at onset, shorter delay in TE diagnosis and more frequent drug-resistance. As epilepsy surgery is a valid treatment option for both syndromes, a standardised diagnostic workup should be implemented for temporal lobe epilepsy (TLE) patients with unknown aetiology to facilitate early detection of UTE and BTE.Copyright © 2019 British Epilepsy Association. Published by Elsevier Ltd. All rights reserved.

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