Endoscopic Third Ventriculostomy
Endoscopic Third Ventriculostomy (ETV) is a minimally invasive surgical procedure performed to treat obstructive hydrocephalus. Instead of implanting a foreign mechanical shunt system, the surgeon uses a high-definition endoscope to create a tiny, natural opening in the floor of the third ventricle. This bypasses the fluid blockage and allows cerebrospinal fluid to flow freely and be reabsorbed naturally.
When this procedure may be recommended
- Obstructive hydrocephalus caused by congenital aqueductal stenosis.
- Tectal plate tumours or pineal region tumours blocking fluid pathways.
- Failed ventriculoperitoneal (VP) shunts in patients with obstructive anatomy.
Who may be a candidate
Ideal candidates are patients (adults and children) with clear obstructive (non-communicating) hydrocephalus where the fluid absorption pathways on the brain surface are healthy. Patients with communicating hydrocephalus or post-haemorrhagic blocks are better treated with a VP shunt.
Advanced medical implant technology (no text). Alternatives to surgery
- Ventriculoperitoneal (VP) shunt insertion (foreign tube system).
- Observation (only for mild, stable, asymptomatic hydrocephalus).
What to expect
- Burr Hole: A single small burr hole is made in the scalp behind the hairline under general anaesthesia.
- Ventricle Entry: A rigid endoscope is guided through the brain into the lateral ventricle and navigated into the third ventricle.
- Visualisation: The surgeon identifies the anatomical landmarks on the ventricular floor (mammillary bodies and infundibular recess).
- Fenestration: A tiny puncture is carefully made in the thin floor of the third ventricle using a specialized probe.
- Dilation: A small balloon catheter is inserted into the puncture and inflated to gently widen the opening to about 4-5 mm.
- Verification: Free flow of fluid through the new opening into the basal cisterns is verified before removing the endoscope and closing.
Technology and imaging
Uses high-resolution micro-endoscopes, navigation guidance, and specialized balloon dilatation catheters.
High-precision diagnostic imaging visualization. 
Clinical Zeiss/Leica operating microscope setup. Hospital stay
Usually 1 to 2 nights in hospital, with quick recovery.
Recovery milestones
- Day 1: Overnight ward monitoring. Headaches typically resolve rapidly.
- Weeks 1-2: Home rest and progressive walking. Stitches are removed at 10-14 days. Avoid strenuous activity.
- Follow-Up: A specialized MRI (cine-MRI) is performed at 6 weeks to verify active fluid flow through the new opening.
Post-operative mobilization and recovery milestones. Risks and complications
- Injury to local vascular structures (basilar artery, carrying a rare but severe risk).
- Transient short-term memory deficits or hormonal imbalances (due to proximity to the hypothalamus).
- Closure of the new opening (stoma closure, approx. 5-10% over time, requiring repeat ETV or shunt).
- CSF leak or local infection.
Frequently asked questions
Why is ETV preferred over a VP shunt?
ETV is highly preferred because it uses a natural fluid bypass and avoids implanting a foreign mechanical shunt tube and valve, which eliminates the long-term risks of shunt infection, blockage, and mechanical failure.