The Benign Epilepsy of Childhood with centrotemporal Spikes (BECCTS) constitutes the most common form of idiopathic epilepsy in the paediatric population.
We present 80 cases with this diagnosis analyzing its clinical and electrophysiological characteristics, and particularly its atypical evolution. Results: 71% were male (relation 2.5:1), the partial motor seizures were the most frequent (40%) followed by the partial generalized secondarily (35%). 75% of the seizures appeared during sleep. The 66% of our patients were not medicated and a patient showed an electro-clinical picture of BECCTS and of Occipital Benign Epilepsy, Panayiotopoulos type, in concomitant form. 5% evolved in atypical form: a patient as atypical BECCTS with compromised language and hyperactivity, another developed a continuous point-wave syndrome of slow sleep and a patient debuted as focal epileptic state in hemi face with anarthria. Conclusions: The present study remarks its differential diagnosis and alerts about the phenomena of secondary bisynchronism that can appear in this type of epilepsy, the role that antiepileptic drugs play in its probable appearance and the proper and adequate changes to avoid future cognitive compromise. However, in 95% of our cases, the evolution of the BECCTS was favourable.

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