My Mother recently had a scan of her brain and head (had a clot go boom behind her eyes and is at risk of stroke; managed by meds) and the doctors discovered she only has One Carotid Artery~she doesn't have one on the left. I was like "how the heck have you been living and breathing your whole life?" The doc told her she either was born with only one or ? they couldn't really explain it.
Wonder if you and my Mom are related? lol