A nonspecific form of dysembryoplastic neuroepithelial tumor presenting with intractable epilepsy.

We report here an intractable epilepsy case with fairly typical clinicoradiological features of dysembryoplastic neuroepithelial tumor (DNT), which means onset of seizures at a young age accompanying a medial temporal cystic lesion enclosed in cortical dysplasia (CD). The medial cystic lesion was composed of two morphologically distinct components; one was oligo-like and the other showed some tendency toward neuronal and glial differentiation, even though they were morphologically different from a so-called specific glioneural element (SGE). Epileptiform discharges were detected not only on the medial lesion but also on the lateral inferior temporal gyrus, which was confirmed as CD. According to both histopathological and clinical features, we named the lesion a nonspecific form of DNT.