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Endoscopic third ventriculostomy (ETV) creates an opening in the floor of the third ventricle so CSF can bypass an obstruction and reach spaces where it can be absorbed. It can avoid an implanted shunt in selected patients. That possibility does not mean every person with hydrocephalus is suitable, or that being free of a device removes all treatment risks.1

Selection depends on context

Age, cause, anatomy and prior treatment affect whether an internal bypass is appropriate. The CNS pediatric guideline recognizes ETV and shunts as options, with clinical selection still required. Findings across mixed child populations cannot establish the best treatment for every infant. Its premature-infant posthemorrhagic chapter addresses a narrower situation and finds insufficient evidence to recommend ETV generally there.23

ETV is not the same as ETV-CPC or EVD

ETV-CPC adds choroid plexus cauterization, directed at reducing CSF production, to the internal bypass. A combined-procedure trial cannot be silently described as an ETV-only trial. An external ventricular drain (EVD) instead routes CSF to an external system during supervised hospital treatment. Neither is simply another name for a long-term implanted shunt. The treating team should explain which intervention is being discussed and why.43

The Ugandan infant trial compared ETV-CPC with VP shunting in a specific postinfectious population. It measured cognition at 12 months alongside separate procedural and imaging outcomes. Its five-year publication follows the same cohort. Those findings do not establish ETV-CPC superiority for all children, nor do they verify that a particular practice offers that combined procedure.45

What “success” should mean

Ask whether an estimate refers to avoiding another CSF procedure, symptom improvement or developmental progress. These outcomes differ. Ask what uncertainty remains and what alternative would be considered if the chosen treatment failed.

Continued care and later failure

An ETV opening can close, or CSF absorption may remain inadequate. Further treatment may include repeat ETV or a shunt according to assessment. Blockage can occur months or years after surgery, so the operation should not be described as permanently maintenance-free.61

Keep the team's plan for follow-up and unexpected changes. New concerning symptoms require prompt professional contact. Severe or rapidly worsening neurological symptoms, reduced responsiveness or a seizure need local emergency care; a long period of improvement does not establish that ETV cannot fail. The website cannot test the opening or replace local assessment.6

References

  1. NHS. Hydrocephalus: Treatment. Source ↩
  2. CNS. Pediatric Hydrocephalus Guideline, Part 4. 2014; updated 2020. Source ↩
  3. CNS. Pediatric Hydrocephalus Guideline, Part 2. 2014; updated 2020. Source ↩
  4. Kulkarni AV et al. Endoscopic Treatment versus Shunting for Infant Hydrocephalus in Uganda. N Engl J Med. 2017;377:2456–2464. doi:10.1056/NEJMoa1707568. Source ↩
  5. Mbabazi-Kabachelor E et al. Five-year outcomes after surgical treatment of infant postinfectious hydrocephalus in sub-Saharan Africa. J Neurosurg Pediatr. 2025. doi:10.3171/2025.1.PEDS24417. Source ↩
  6. NHS. Hydrocephalus: Complications. Source ↩