Nobody here (or anywhere) in their right mind will advise you to do anything but follow the directions of your neurosurgeon. If it were me I wouldn't lift for at least a month after. I'd start with low weights and progress slowly for the next month after that. If no ill effects, I'd run a judicious LP and come back up to weight. Red flags are rhinorrhea and otorrhea (clear fluid draining outta da head or ears), headache, nausea, fever, collapse, death, etc. All unlikely.
But if somebody removed a PART OF MY SKULL and scraped shit OFF MY BRAINSTEM, and I woke up alive, I'd do whatever the fuck they told me for at least six weeks.
This post is for ejumacational and infotainment porpoises only and does not constitute medical advice for you or any other particular person, patient, disease, or condition. Sullydog is not your doctor. Actually, he's not anybody's doctor anymore, a circumstance from which he derives unremitting satisfaction and joy. He never even contemplated training or practice as a neurosurgeon, because he wanted to have a life and not be married to the hospital, and becaise those brain surgery guys are all a bit twitchy and bitchy. You shouldn't believe anything Sullydog says, and you should obey your own physician without question, regarding all of his pronouncements with the utmost credulity and reverence.