<unk> s are commonly used to treat hydrocephalus, the swelling of the brain due to excess buildup of cerebrospinal fluid (CSF). If left unchecked, the cerebrospinal fluid can build up leading to an increase in intracranial pressure (ICP) which can lead to intracranial hematoma,<unk>  edema, crushed brain tissue or herniation. The<unk>  can be used to alleviate or prevent these problems in patients who suffer from hydrocephalus or other related diseases. Shunts can come in a variety of forms but most of them consist of a valve housing connected to a catheter, the end of which is usually placed in the peritoneal cavity. The main differences between shunts are usually in the materials used to construct them, the types of valve (if any) used, and whether the valve is programmable or not.
Cerebral shunt
Lumbar–peritoneal shunt
Cardiac shunt
Sano shunt
Cerebrospinal fluid diversion
Ventriculotomy 
Ventriculostomy
Atriocaval shunt