This 3D animation of brain surgery, shows how a ventriculostomy is performed, which is a neurosurgical procedure of creating a hole within a cerebral ventricle for drainage. It is most commonly performed on those with hydrocephalus, an abnormal buildup of fluid in the ventricles (cavities) deep within the brain. It's done by surgically penetrating the skull, dura mater, and brain such that the ventricular system ventricle of the brain is accessed.

When catheter drainage is temporary, it is commonly referred to as an external ventricular drain (EVD). When catheter drainage is permanent, it is usually referred to as a shunt.

There are many catheter-based ventricular shunts that are named for where they terminate, for example, a ventriculi-peritoneal shunt terminates in the peritoneal cavity, a ventriculoarterial shunt terminates within the atrium of the heart, etc. The most common entry point on the skull is called Kocher's point. An EVD ventriculostomy is done primarily to monitor the intracranial pressure as well as to drain cerebrospinal fluid (CSF), primarily, or blood to relieve pressure from the central nervous system (CNS).

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