About 10% of cases in which excess bleeding (hemorrhage) is the first symptom are deadly. Some patients may have permanent seizures and brain and nervous system (neurological) problems.
AVMs that do not cause symptoms by the time people reach their late 40s or early 50s are more likely to remain stable and rarely cause symptoms.
What to expect if I have Cerebral arteriovenous malformation  (Outlook/Prognosis)?
About 10% of cases in which excess bleeding (hemorrhage) is the first symptom are deadly. Some patients may have permanent seizures and brain and nervous system (neurological) problems.
AVMs that do not cause symptoms by the time people reach their late 40s or early 50s are more likely to remain stable and rarely cause symptoms.