system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do neurosurgeons get to the middle of someone’s brain without damaging other parts of the brain?
gpt
In short, they don’t. 

Detailed imaging (pre-op MRI and intra-operative CT) are often used to create a robust surgical plan which includes trajectories, burr hole locations, and implant targets to minimize risk of bleeding, damage to important speech regions, etc. Unintended cognitive, personality, speech, and motor symptoms are not uncommon following major neurosurgery. These kinds of side effects are often temporary, but no guarantees. 

Source: neural engineer who studies deep brain stimulation.