Welcome to the site. Sorry that you had to find us all and I'm sorry to hear about your mum, but glad that you have joined in with us all as you're in the right place for support and help and I know that you will get loads of both from everyone here. Education about everything to do with CC is so important and the better informed you are the better equipped you will be for making decisions about everything and with helping your mum.
Please come back often, post as much as you want and ask questions and we'll do our best to help. Has your mum thought about getting a second or even a third opinion on the surgery and if so where? I hope that the PET gives some good news for your mum and please let us know how that goes. Please know as well that we are here for you and we care.
My best wishes to you and your mum,
Any advice or comments I give are based on personal experiences and knowledge and are my opinions only, they are not to be substituted for professional medical advice. Please seek professional advice from a qualified doctor or medical professional.