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Hi Tony. Having a shunt placed has some risks associated with it, but the procedure is generally a well tolerated procedure and successful in experienced hands. The main risks include shunt failure, with build up of pressure in the ventricles and worsening of your symptoms, or infection, with new symptoms and a risk of meningitis or encephalitis. If you have NPH, the prognosis with or without the shunt depends on the cause of the NPH and how fast the process it is progressing. Most individuals without a shunt do tend to experience symptom progression slowly.