<prompt> All of the following are neuronal tumors, except-GangliocytomaGangliogliomaNeurocytomaEpendymoma  <response>: Conventional classification of CNS tumorsConventionally, CNS tumors are classified into following three groups:-Glial tumors :- Primary tumors of the CNS that arise from the three glial cells present in the CNS, i.e., astrocytes, oligodendrocytes and ependymal cells. Examples are astrocytomas, oligodendrogliomas, ependymomas, mixed gliomas.Neuronal tumors :- Primary tumors of the CNS that contain mature appearing neurons or show neuronal lineage. Examples are neurocytomas, gangliocytomas and gangliogliomas.Embroyonal tumors poorly differentiated tumors :- Primary tumors of the CNS which thought of neuroectodermal origin express few if any phenotype features of mature cells of the nervous system. Examples are medulloblastomas, neuroblastomas and ependymoblastomas. 