Jan,
I think in some cases, they do drill the bone out rather than making a window. My surgeon sorta "sanded" it down with a drill until it was paper thin (that's actually what it said on my OR report) and then they just remove the paper thin part. I'm pretty sure he came into the OR with a toolbox that said Craftsman on it!
So, if it's done that way, there obviously wouldn't be any way to put the bone back when they close you up. Some doctors use titanium mesh, screws, spackle, etc. I just got the abdominal fat (and they didn't take all of mine either!
) packed in there and got closed up. If they do the "window", then they obviously can put the bone piece back in if they choose to.
I would think that it's safer to leave the bone out only if they do translab, since that area of your head gets a little protection from your ear anyway. Some of the other approaches aren't afforded any protection and it might not be a good idea to walk around with a big soft spot on your head in a place you could easily bump.
Seems like with all other aspects of AN things, every doctor has his own way of doing things.
Lori