Hi Glass100,

Do you have a reference for the known causes being mostly blockage or narrowing, because that doesn't jive with what I've read. Everything I've read says most NPH is idiopathic and shunts are still the primary treatment. I know I've mainly read about NPH due to my child having low compliance and since her hydro is communicating and may be similar cause. I know infections can cause issues with absorption. As with kids, anything that can avoid someone being shunt dependent is something to consider so I do hope ETV works for you, there just aren't many options. Diamox or repeated lumbar punctures are temporary options.