Surgery performed on the skull where pieces of bone are removed and the bone pieces are not replaced. Surgery performed on the skull where a portion of bone is removed and the bone is put back in its place. A special dye material may be injected into the patient's vein prior to the scan to help make any abnormal tissue more evident. A sac filled with fluid. The membrane that limits the sac is made up of cells which secrete the fluid that fills the sac.
Cysts can occur in association with tumors or infections or can be congenital.
A surgical procedure to decrease mass effect by removing a portion of a tumor or dead tissue. See mass effect. Decadron is used to decrease tissue swelling and edema due to breakdown of the blood brain barrier. Swelling due to an excess of water. The EEG may be useful in monitoring seizures and other brain activity.