Tumor Related Epilepsy

* INCLUSION CRITERIA: To be eligible for entry into the study, a candidate must meet all the following criteria: * Be 8 years of age or older. * Have solitary primary or recurrent brain tumor with associated seizures. Brain tumor may be diagnosed radiologically. Associated seizures are defined as those with activity starting within three months of radiologic diagnosis of the primary or recurrent tumor. In cases when the timing of seizure activity is unclear with respect to the timing of diagnosis, seizures will be considered associated with the tumor if seizure semiology is consistent with that location. Ongoing seizures are not required. Patients can be included if they have had a single previous seizure. Patients who have not experienced seizures after institution of anti-convulsant therapy are not excluded. EXCLUSION CRITERIA: Candidates will be excluded if they: -At the time of enrollment, lack consent capacity due to cognitive impairment that would make them incapable of understanding the explanation of the procedures in this study. Cognitive capacity to consent will be determined at the time of enrollment. Patients with mental disorders or those patients who are cognitively impaired yet still retain consent capacity will not be excluded. Children may be enrolled if there is a parent or guardian able to consent on their behalf.