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Skull is missing. this was -- i don't know how much of that was taken out for the expansion of her brain, the swelling and how much she lost in the shooting. what would she look like with that section of her skull missing and what are some of the risks involved? >> yeah. that operation called a craniectomy basically is as you say, to try to control swelling at the time of the injury. let me show you quickly if i can, i don't know how well you can see this, this is a skull and this is sort of what a craniectomy would look like. i did this on a model yesterday to show you guys. about the size of...

Believe all the victims were taken. trace, what are doctors most concerned about at this hour? >> the big worry still, shep, is brain swelling. the fear is the brain swells too much, it will constrict the blood flow, but so far there's no change on that. we can tell you that gabrielle giffords is responding simple commands, like squeezing doctors' fingers, giving a thumbs-up, putting her fingers up and moving her toes. that's good. they've also done another cat scan on her. they take this cat scan, and they match it to the previous cat scans to make sure that no fluid is leaking. so far that a...