Many organic diseases of the brain - including intoxications, inflamma
tory or neoplastic disorders - can cause acute psychosis. Even if the
psychotic symptoms last for several years, the possibility of an organ
ic cause should be borne in mind. We report the case of a patient with
a paranoid disorder for two years before admission. The EEG showed ge
neralized 1-2 Hz spike and wave complexes. These epileptic activities
- and also the paranoid symptoms - ceased completely after administrat
ion of an antiepileptic medication.