Diencephalic Glioblastoma Diencephalic Glioblastoma Multiforme Diencephalic Grade IV Astrocytoma GBM of Diencephalon GBM of the Diencephalon Glioblastoma Multiforme of Diencephalon Glioblastoma Multiforme of the Diencephalon Grade IV Astrocytic Neoplasm of Diencephalon Grade IV Astrocytic Neoplasm of the Diencephalon Grade IV Astrocytic Tumor of Diencephalon Grade IV Astrocytic Tumor of the Diencephalon Grade IV Diencephalic Astrocytic Neoplasm Grade IV Diencephalic Astrocytic Tumor