<unk>  is a procedure that is used to drain<unk>  from the brain and spinal cord. A shunt is placed in a ventricle of the brain and threaded under the skin to another part of the body, usually the abdomen. It is used to treat hydrocephalus and idiopathic intracranial hypertension.
Cerebrospinal fluid diversion
Lumbar–peritoneal shunt
Ventriculostomy
Craniotomy
Ventriculotomy 
Endoscopic third ventriculostomy
Decompressive craniectomy
Cerebral shunt