Wiktionary
neurocytoma
n. A nervous system tumor primarily derived from nervous tissue, in contrast to the gliomas.
Wikipedia
Neurocytoma
Neurocytoma (or neuroepithelioma) is a type of nervous system tumor which is primarily derived from nervous tissue. This is in contrast to the gliomas (such as oligodendroglioma), which are derived from glial cells, which are not derived from nervous tissue.