Is it common to have dementia after brain surgery?

No: Underlying cognitive issues can be worsened following surgery, but to have new dementia following brain surgery would be unusual. Complications, such as stroke or infection, could lead to such problems. Consider what the surgery was for. Ruptured aneurysms in certain locations are one instance commonly associated with cognitive changes.

Not dementia: This is a very broad question because the reasons people have surgery on their brain, as well as their pre-surgical conditions vary widely and will contribute to their neurologic cognitive function after surgery. Dementia has many etiologies and forms, most commonly senility, ad, and pd. There is dementia pugilistica from head injury, and delayed cognition after surgery.

Depends: Any surgery can have risks of not only developing for bleeding, infections or swelling but also developing of worsening of dementia if person has history of dementia or memory loss. Medications during the procedure may have cause dementia but there are lack of studies that cause it. Decreased blood flow to brain is the possibility. It is very important to have neurologist to check before surgery.