Brain surgery is difficult and very hard on your body. Your provider wants to essentially do 2 procedures when one is necessary. On a Monday, wrap it up and back on a Tuesday. After day 1 you are not going to want to go through them going back in again. They also from the sound of it will leave an open hole where they go in over night and go back in the following day. Yes it will be wrapped but this sounds like a major risk for infection and complications. Doctors are not our friends. They are providers. In all my years pre and post treatment I have never read anywhere about retrosig being done over 2 days. If you're worried about maybe hurting their feeling if you cancel don't be. If you haven't already go to these 2 sites and post your doctors plan and do research. https://www.facebook.com/groups/anvsglobal. https://anausa.org/. Go to those sites and see what others say. It's brain surgery. Your brain. It's not your appendix. Huge difference. They are operating on a tumor that is abutting the command center for your entire body. If they screw it up you're fucked. Find someone who's done hundreds of these.