The EEG may be useful in monitoring seizures and other brain activity. An encapsulated tumor is preferred of a difused tumor which has tentacles infiltrating healthy tumor tissue. The nature of most malignant tumor is they are difused. From the Latin glue. They are not the primary transmitters of information, these are neurons.
Glial cells provide nutritional, metabolic, and mechanical support to neural tissue.
There are glial cells which surround blood vessels bringing nutrition into the brain, these same glial cells, called astrocytes, also surround the neurons which depend on the astrocytes for transferring nutrition from the blood to the neurons. Thus the astrocytes are an essential component of the blood-brain barrier which is a cellular buffer zone between the neurons and the blood. Most aggressive of glial neoplasms. Most difficult to treat. Intensive research is ongoing to discover a cure or life-prolonging therapy for glioblastoma.