system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do neurosurgeons reach and fix lesions deep inside the brain without affecting outer tissues?

Non-native English speaker here. 

Suppose you have a stroke or some other medical abnormalities in the center of the brain. Where there is a bleeding, clot, or some other anomaly. 

How would neurosurgeons go about reaching it given its deep in the center? If it was on the outside, the anomaly could have been cut or sutured. But if it is deep inside, then wouldn't cutting through all these massive tissues destroy brain functionality in other areas?
gpt
There’s no magic. The brain isn’t as solid as you might think. It’s a bunch of folded up tissue floating in some fluid. You can poke and move things around. So they look at scans, come up with a plan, maybe poke or otherwise stimulate tissue to verify boundaries, then cut and hope for the best.