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  • untreated - mortality is approximately 45% in the first 8 weeks
  • rebleeding (a major cause of mortality) occurs in 30-40% of patients surviving the initial episode and peaks at 7-14 days.
  • cerebral vasospams may occur in the territory of the vessel of the aneurysm.
  • in 10% of patients who rebleed the source of bleeding is from an angioma.

Last reviewed 01/2018