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Brain. if i were to take off the brain and the skull, you see is brain underneath, between the brain and the skull there's a space, that's where himatoma can accumulate. >> how does that affect the function to have brain? >> couple different types, acute, people in severe accidents, motor vehicle accidents or collusion, acute collection of blood that rapidly expands, cause somebody into a coma or kill them, what mr. trebek suffered from, hit their head on something that you and i couldn't think of, kitchen cabinet, car jam or doors you're getting in and slowly over time the blood accumulates a...

Sanjay, you perform these surgeries every week. you did a demonstration of how much of her skull had to be originally removed to save her life. i want to take a quick look at that. >> one thing to keep in mind, the brain, unlike other organs of the body, if it starts to swell, it's got nowhere to go. it can only go downwards and that's called a herniation. the second part is to connect these holes. this is the last cut now we're making. one of the things that's really important is when you take this bone out, you want to make sure that you're protecting the brain underneath. go ahead and lift ...

Look at that. >> one thing to keep in mind, the brain, unlike other organs in the body, if it starts to swell, it's really got nowhere to go. it can only go downwards. and that's what's called a herniation. and the second part is simply to try and connect these holes. this is the last cut now we're making. one of the things that's really important is when you take this bone out you want to make sure that you're protecting the brain underneath. let me go ahead and lift that bone right out of there. and this is the area where the brain is actually allowed to swell now. >> so for four months she'...

Recovery of congresswoman gabrielle giffords. she was shot in the head at a constituent meeting in arizona back in january. severely wounded, six people were killed in that attack. today, giffords underwent surgery to replace a piece of her skull that doctors removed because of brain swelling. a hospital says she's doing well tonight. i spoke to dr. sanjay gupta about the procedure a short time ago. sanjay, you perform these surgeries every week. you did a demonstration of how much of her skull had to be originally removed to save her life. i want to take a quick look at that. >> one thing to ...

These holes. this is the last cut now we're making. one of the things that's really important is when you take this bone out, you want to make sure that you're protecting the brain underneath. go ahead and lift that bone right out of there. this is the area where the brain is allowed to swell now. >> so for four months she's been living and traveling with that much of her head removed? >> yeah. surprisingly to a lot of people, this is not that uncommon. let me just show you again. you just saw that -- just to give you an idea of how much we're talking about here, that's how much, a significant...