Neoplasm Dysembryoplastic Neuroepithelial Tumor true A benign glial-neuronal neoplasm. It is usually supratentorial, located, generally, in the cortex and occurs in children and young adults with a long-standing history of partial seizures. A histologic hallmark of this tumor is the 'specific glioneuronal element', characterized by columns, made up of bundles of axons, oriented perpendicularly to the cortical surface. (Adapted from WHO) C1266177 A dysembryoplastic neuroepithelial tumor (DNET) is a glioneuronal tumor that is cortically based, usually with a multinodular and/or multicystic appearance. Histologically, DNET's are characterized by oligodendrioglial like cells, intermixed with neuronal and astrocytic cells, with minimial cellular atypia. They are commonly found in the temporal lobes, but can be found elsewhere. They are frequently found to co-occur with adjacent focal cortical dysplasia (FCD IIIb), suggesting a common developmental etiology for both structural abnormalities. DNT C9505 Dysembryoplastic neuroepithelial tumor Dysembryoplastic Neuroepithelial Neoplasm Dysembryoplastic Neuroepithelial Tumor 9413/0 DNET Undetermined Dysembryoplastic_Neuroepithelial_Tumor Neoplastic Process 9413/0 Dysembryoplastic Neuroepithelial Tumor