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I am sorry you're so worried. I understand why you are though after losing your dad to cancer.
It does sound like the consultant is concerned if I'm honest but until he speaks to your mum and explains the results there is no way of knowing. Do you have a good friend or other family you can talk to?
My mum had breast cancer and a chest x ray showed lung shadows. It happened 3 times and each time she was sent for CT scans. Once I was told by the consultant he was pretty sure she had cancer in the tube leading into her lung. He showedme the thing on the chest x ray and she also had breathing problems. Every time it turned out to not be anything- just age and scarring and how she had been positioned fot the x ray/ scan.
It does sound like the consultant is worried, I agree, but it does not mean she does have cancer. If she has, you will cope. You will. All the worrying you do between now and Monday won't change anything. Try to keep your mind occupied.
You will be there with her on Monday and I hope it is good news. Easier to say don't worry than to do it.
My mum died of old age, despite all the health horrors we went through. I worried myself sick over about 10 years and none of them were related to her eventual death.
I've been following your thread and I'm so, so sorry - I was so hoping for good news for you. There's a lot of support out there for families like yours - emotional, practical,financial - like Lulujakey says, try to get down all the questions you want to ask and grab all the help you can. Xx