C69-C72: Malignant neoplasms of eye, brain and other parts of central nervous system
  C71: Malignant neoplasm of brain
    C71.8: Overlapping lesion of brain

C710-C714, C717-C719, C720-C725: Brain, & cranial nerves, & spinal cord, (excl. ventricle, cerebellum)
  944: Glioblastoma, nos
    9440/3: Glioblastoma, NOS

unclassifiable

neoplasia {leukoplakia}
  tumour {tumor,neoplasm}
    malignant tumour {cancer}
      glioblastoma

nervous system
  central nervous system {CNS}
    brain

glioblast

Homo sapiens

Unknown