Craniotomy is a invasive surgery to make an opening in the skull. A section of the skull, called a bone flap, is removed to access the brain underneath. It may be performed to treat brain tumors, hematomas (blood clots), aneurysms or AVMs, traumatic head injury, foreign objects (bullets), swelling of the brain, or infection. The bone flap is usually replaced at the end of the procedure with tiny plates and screws.
Risks include Bleeding and Infection. Recovery takes 2 weeks approximately. Headaches are common after surgery.