OBJECTIVE: to evaluate the tomography-electroencephalography agreement in pediatric patients attended with epilepsy diagnosis at service neuropediatric in the Medical Unit of High Specialization "Adolfo Ruiz Cortines," during the period from January to October of year 2006. METHODS: retrospective, cross-sectional, descriptive, correlational, observational. One hundred eighty files of pediatric patients were reviewed with clinical diagnosis of epilepsy with electroencephalography of date next to their study of tomography; the agreement was realized with the test of kappa, comparing the results of each diagnosis method, in each patient. RESULTS: of 69 patients, 10 patients were catalogued as normal by both methods and 23 showed cerebral alterations in the same site of epilepsy focus; the observed agreement was 47.8 % with an index of kappa of 0.095 CONCLUSION: the agreement between the electroencephalography and the computed tomography is very low, in the findings of cerebral structural injuries related to the location of the epilepsy focus in pediatric patients with epilepsy diagnosis.