My 14 year old son was diagnosed with a double fusiform aneurysm in his left carotid artery in his cavernous sinus in January of 2011 after being seen in the emergency room for severe migraines. It had been stable for a year or so but began to grow rapidly this past year. It grew 50% in 3 months and the Doctors at Johns Hopkins want to close his left carotid artery. I see that there are people on this forum who were born with only one but I am terrified of what closing off one will do to my son. They are going to do an occulusion first, see if he needs a bypass and then close it. They are informing me of risks like stroke, brain damage, death. It is all very scary and I am not telling my son any of these risks. Has anyone heard of any success in closing off one carotid? They doctors say it is rare and especially rare in a child/teenager.