I totally understand that and do feel awful for your poor friend, you are doing the right thing by researching. It is very difficult to make that decision, I would speak to your doctor though if you are worried as depending on your problem it may not be absolutely necessary for you to have it. However if you don't have it some things do not necessarily show up on the scan, which is a bit of a catch 22 situation as it means then that there are risks either way! Sorry I know that's not very helpful. Do double check with your doctor if it is necessary.