In the literature the term —idiopathic epilepsyii is frequently used in cases, where the etiological factor was not determined. Up to 70% of cases are diagnosed as —idiopathic epilepsyii and 80% of epileptic seizures originate before the age of 25 years. Development of structural lesions in the brain and influence of genetics are very important factors in the etiology of epilepsy. In this paper cases of four patients are discussed. Conclusions: even determination of the genetic factor does not exclude that epilepsy is a syndrome with many etiological factors. The relative importance of perinatal factors, nutrition, trauma and other environmental influences must be considered. In our opinion, the term "idiopathic epilepsy" is incorrect, inaccurate and we propose a more appropriate term "epilepsy" ("epileptic syndrome") of "unclear" or "uncertain genesis".

        Key words: idiopathic (genuine, cryptogenic) epilepsy, etiology of epilepsy, congenital causes of epilepsy