They map out their route as others have said. One thing being missed is the various approaches a surgeon will use to get to different pathology locations. They will position the patient in different ways to drop or slack the brain and then lift up various “folds” of the Brian if possible.
They will drill down the orbit or take off part of the sinuses etc. Skull based surgeons do crazy shit to get to the base of the skull that’s why those cases go for 20 hours sometimes or even multiple stages.
-neurosurgery NP
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