Liz, thank you very much for that link. It answered a lot of my questions. My mom counts on the dr. to explain to her what he's going to do. She has no computer to look all of this up, sometimes I think that may be for the better. I wrestle with whether to tell her what I'm learning or not. She wants to know what to expect so I can't wait to find out tonight what the dr. told her. I'm trying to think of things to do with her to help take her mind off of the wait before surgery. Thanks again for helping me understand it better - I really appreciate it. Take care of you - Nancy T