Hi Kat77
sorry to hear your mum is having this worry.
I had my rads last month, just before it started I had a definite lump and my BCN said it was normal after surgery. I didn't notice it before as the area was swollen. Once the swelling had gone down I could feel it.
now my rads are finished I feel a bit lumpy round my scars. If someone has taken a look I would not be too worried but if it is preying on your mother's mind there is no harm in asking for a scan. It won't be treated as urgent so could be ages before she gets seen.
Keeks