How long you you have to live if you have an untreated leaking or rupturing brain anerysm?

Bad outcomes: A ruptured brain aneurysm has a 50% immediate mortality, and those folks are not accessible for salvage. Of the remainder, surgery and supportive therapies are very successful, and many have a normal lifespan. If there is a so-called sentinel leak, this is an ominous sign of need for relatively rapid attention, as risk looms if ignored.