Malignant tumors indicate often lethal brain conditions, but even nonmalignant growths can preempt normal brain activity. Any tumor may compress regions of the brain and increase internal pressure, upsetting the organ's delicate functional balance. This is when neurosurgery come into play. Surgery is the initial treatment for most benign and many malignant tumors. It's worth noting that these kind of procedures are performed on patient who are either asleep or heavily sedated. In addition, the brain does not “feel” pain, and all of the surrounding tissues (eg, the scalp) are numbed prior to surgery.