Thanks so much for your prayer and concern guys. They seem to have pretty much determined that it was not a split artery, which is good, but one of the nuerologists thinks that he still sees something unusual (I know from last time that you can hardly get these guys to agrea on the color of an orange!) so they have decided to keep him over night. We kind of wanted him to be able to come back tonight, but I guess this is good, since they'll be able to moniter him and make sure everything goes ok. So it's our hope that he will be able to come home tomorrow.