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Outcome After Surgery
- Multiple shunts commonly needed: 40% of patients require both supratentorial and infratentorial shunts, 20% require lateral ventricle shunts, 20% require cyst shunts, and 20% are shunt independent.
- Need for shunt revisions common: Shunt revisions are relatively common and may average as high as 1 per year of follow-up.
- Cognitive impairment: 50–75% of patients have intellectual impairment, which may be mild to severe. This impairment is due to the congenital malformation independent of surgical intervention.