Question: What is the outlook for Sturge-Weber Syndrome ?
Answer: Although it is possible for the birthmark and atrophy in the cerebral cortex to be present without symptoms, most infants will develop convulsive seizures during their first year of life. There is a greater likelihood of intellectual impairment when seizures start before the age of 2 and are resistant to treatment. Prognosis is worst in the minority of children who have both sides of the brain affected by the blood vessel abnormalities.
Source: NINDS