The authors study the results of gammaencephalometry in 42 epilepctics over 10 years of age, without focal neurological signs or intracranial hypertension. The importance of this examination in epilepsy is emphasized, because it detects non-tumoral structural alterations. The existence of 33% of gammaencephalometric anormalities in cases with a normal EEG suggests the possibility of using gammaencephalometry in the differential diagnosis between epilepsy and neurosis. Nevertheless, in order to reach a more definite conclusion, it is necessary to study a larger number of cases, inclusively using roentgenography with a contrast medium. Anyway, owing to its hamlessness and feasibility, the authors think that gammaencephalometry is indicated in all cases of epilepsy that require full data.