Treatment is often largely dependent on the type of<unk> . Asymptomatic<unk> s, termed pseudocysts, normally require active monitoring with periodic scans for future growth. Symptomatic (producing or showing symptoms)<unk> s may require surgical removal if they are present in areas where brain damage is unavoidable, or if they produce chronic symptoms disruptive to the quality of life of the patient. Some examples of<unk>  removal procedures include: permanent drainage, fenestration, and endoscopic<unk>  fenestration. Permanent drainage A neurosurgeon may open a portion of the body and insert a shunt into cerebral spinal fluid (CSF) filled<unk> s to allow drainage into CSF pathways. The fluid from the<unk>  is then drained into the abdomen, the body reabsorbs the fluid (reabsorption of fluid does not cause any harm). This type of surgical treatment is often performed to relieve pressure on the brain from a<unk>  within the cerebral cortex. Fenestration A neurosurgeon performs a craniotomy as a means of entry to access the<unk> . The<unk>  is then opened to release its contents, which are reabsorbed by the brain. This is commonly used with inflammatory<unk> s located in the ventricles, and can result in increased ventricular fluid flow within the brain. Endoscopic<unk>  fenestration A neurosurgeon performs a same day surgery to insert an endoscope, which drains the<unk>  internally.
Central nervous system cyst
Glial tumor
Chiari malformation
Brain metastasis
Choroid plexus tumor
Brain stem tumor
Primary central nervous system lymphoma
Central nervous system cavernous hemangioma