title: Problems of the classification of tumors of the nervous system and the significance of electron microscopy.
mesh_terms: D000708:Anaplasia / Q000145:classification; D001254:Astrocytoma / Q000145:classification; D001812:Blood-Brain Barrier; D001932:Brain Neoplasms / Q000145:classification; D004407:Dysgerminoma / Q000145:classification; D005909:Glioblastoma / Q000145:classification; D005910:Glioma / Q000145:classification; D006801:Humans; D008854:Microscopy, Electron; D009423:Nervous System Neoplasms / Q000145:classification* / Q000382:microbiology; D009442:Neurilemmoma / Q000145:classification; D009837:Oligodendroglioma / Q000145:classification; D010870:Pineal Gland; D010871:Pinealoma / Q000145:classification