A case of cerebral ganglioglioma, a relatively rare and controversial tumor of the central nervous system, is reported. The histological pattern of the tumor consisted of differentiated neuronal cells and glial elements displaying a various extent of cytologic abnormalities. Beside these two typical components for ganglioglioma, an abundance of collagen fibrils and numerous blood vessels were encountered. The long clinical course manifested by temporal epilepsy preceding clinical diagnosis of brain tumor and peculiar histological appearance seem to be of considerable interest.