It is an outgrowth of a type of glial cell.

It is called a glioma because it arises from glial cells.

Furthermore, it has been proposed that glial cells are involved in information processing through their bi directional signaling with neurons.

PML is an opportunistic infection with neurological progressive symptoms caused by the replication of the JC virus in the glial cells of the brain.

But it turns out the glial cells have a vital role in the modulation, amplification and, in the case of pain, the distortion of sensory experiences.

These cells, called glial cells, were once thought to be unimportant structural elements of the spinal cord that did nothing more than hold all the important things together, like the nerves.

They are also distinct from the pseudorosettes of an ependymoma which consist of tumor cells with glial fibrillary acidic protein (GFAP) positive processes tapering off toward a blood vessel (thus a combination of the two).

Their DNA starts to synthesize new proteins, which spill out and interact with adjacent nerves, and they start releasing their neurotransmitters, and those neurotransmitters spill out and activate adjacent glial cells, and so on and so forth, until what we have is a positive feedback loop.