system
Given the following post, respond as if you're commenting on Reddit:
human
What happens to dead brain tissue after a cerebrovascular event (e.g.: stroke)?

Does it stays there as inactive tissue? Can it cause any problems? Or there is some mechanism to "clean" dead tissue out of the brain?
gpt
In the Central Nervous System, dead neuronal tissue would be broken down by a specialized Glial cell called Microglia; whose job is to circulate the nervous system and swallow up/destroy odd bits of foreign/non-functional matter. The "empty space" left by those deconstructed cells would be replaced by other various glial cells (probably astrocytes through scarring). 

You pretty much have "janitors" in all parts of your body.