SUMMARY -We describe the case of a 15-year-old boy who had the diagnosis of benign partial epilepsy of childhood with centrotemporal spike. During the EEG a subclinical electrographic seizure was recorded. The discharges were clearly electropositive in T4 with positive phase reversal between derivations F8-T4 and T4-T6. The whole episode lasted less than one minute (45 sec). The interictal right medio-temporal spikes reemerged after 60 sec and were electronegative in the same location after the end of the electrographic seizures. The mechanisms underlying this uncommon pattern on EEG is not well stablished.KEY WORDS: EEG, dipole reversal, benign partial epilepsy of childhood with centrotemporal spike.
Reversão de dipolo: um achado crítico em um paciente com epilepsia parcial benigna da infância com ponta centrotemporalRESUMO -Relatamos o caso de um menino de 15 anos com o diagnóstico de epilepsia parcial benigna da infância com ponta centrotemporal. Durante o EEG uma crise eletrográfica subclínica foi gravada. As descargas estavam eletropositivas em T4 com reversão de fase positiva entre as derivações F8-T4 e T4-T6. O episódio durou menos que um minuto (45 seg). As espículas inter-ictais, na região temporal média direita, reapareceram 60 seg após e estavam eletronegativas na mesma região depois do término da crise eletrográfica. O mecanismo subjacente a este padrão incomum no EEG não está bem estabelecido. PALAVRAS-CHAVE: EEG, reversão de dipolo, epilepsia parcial benigna da infância com ponta centrotemporal.During the last years an epileptic syndrome, associated with rolandic spikes, was recognized and it is known as benign partial epilepsy of childhood with centro-temporal spikes (BECT) 7 , also termed benign rolandic epilepsy 17 . There are few reports in the literature during the ictal phase 5,6,12,15 and only one paper during a diurnal seizure 13 . We are aware of four publications of BECT during a "status epilepticus" 3,5,916 and of one case with ictal dipole reversal 12 .We report an ictal feature on the EEG with dipole reversal in BECT.