This is the classic "brain surgery" operation. Craniotomies are done for removal of benign tumors, aneurysms, infections and hematomas. Some are very minor operations; some are quite involved. Thanks to modern techniques of computer-aided image-guided surgery, these operations are much better tolerated by the patient than in the past. Often, only minimal hair removal is required. These operations are serious and thus, they should be discussed with a qualified surgeon.