I'm sorry to hear that your Mum has had some health concerns over the last few months. It's understandable that you may have questions and concerns about her symptoms.
Only the doctors responsible for her care will be able to explain the x-ray results and the changes in her weight so if your Mum is agreeable, you can get in touch with them for support regarding your Mum's health.
Hopefully they will be able to give you some answers and reassurance.
