What it is
Endoscopic third ventriculostomy (ETV) uses a small camera (neuroendoscope) introduced through a burr hole in the skull to navigate inside the brain's ventricular system. A small opening is made in the floor of the third ventricle, creating a new pathway for cerebrospinal fluid to bypass an obstruction and drain into the natural CSF spaces around the brainstem — restoring normal flow without any implanted hardware.
Why it matters
For patients with obstructive hydrocephalus, ETV offers the possibility of treating the condition with no permanent implant. When successful, it frees the patient from the long-term burden of shunt hardware — the need for monitoring, the risk of mechanical failure, and the possibility of multiple revisions over a lifetime.
Who is a candidate
ETV works best when there is a clear mechanical obstruction to CSF flow and the anatomy of the third ventricle floor is amenable to the procedure. It is less effective in communicating hydrocephalus (where absorption is impaired rather than flow obstructed), and its success rate varies significantly with age — younger infants have lower ETV success rates and may be better served by shunting.
An ETV Success Score (ETVSS) is used to estimate the probability of success for individual patients, and this discussion is part of the preoperative planning process.
What to expect
ETV is performed under general anesthesia through a single small burr hole, typically in the right frontal region. Hospital stay is usually one to two nights. When the procedure is successful, patients notice gradual improvement in symptoms over days to weeks as CSF pressure normalizes. A small percentage of ETVs fail — either early or late — and shunt placement remains the backup option.