====== Endoscopic third ventriculostomy success rate ======

Overall success rate is ≈ 56% (range of 60–94% for nontumoral aqueductal stenosis (AqS)). Highest maintained patency rate is with previously untreated acquired AqS. The success rate in infants may be poor because they may not have a normally developed subarachnoid space. There is a low success rate (only ≈ 20% of TVs will remain patent) if there is pre-existing pathology including:

1. tumor

2. previous shunt

3. previous SAH

4. previous whole-brain radiation (success with focal stereotactic radiosurgery is not known)

5. significant adhesions visible when perforating through the floor of the third ventricle at the time
of performance of ETV
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Also in the elderly, [[Endoscopic third ventriculostomy]] is a safe and efficient procedure, with success rates similar to the younger population. Further research is required to set up a prognostic scoring system for this age group
((Niknejad HR, Depreitere B, De Vleeschouwer S, Van Calenbergh F, van Loon J.
Results of endoscopic third ventriculostomy in elderly patients ≥65 years of age.
Clin Neurol Neurosurg. 2015 Mar;130:48-54. doi: 10.1016/j.clineuro.2014.12.009.
Epub 2014 Dec 31. PubMed PMID: 25576885.)).
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A repeat [[endoscopic third ventriculostomy and choroid plexus cauterization]] can be an effective salvage therapy in the event of ETV failure
((Kono M, Tsuda K, Yamashita M, Ihara S. Repeat [[endoscopic third ventriculostomy]] combined with [[choroid plexus cauterization]] as [[salvage surgery]] for failed endoscopic third ventriculostomy. Childs Nerv Syst. 2022 Apr 19. doi: 10.1007/s00381-022-05488-6. Epub ahead of print. PMID: 35438316.)).

===== Scores =====
see [[Endoscopic third ventriculostomy success score]] (ETVSS)