Hello...where do I start. I'm so confused with the whirlwind that has been the past year and a bit.

Back in November 2019 my mother got taken to hospital for high blood pressure. They did some routine scans and after a  CT noticed she had a small shadow. They said she would need a PET scan.

As we got home from the hospital they called to say it wasn't necessary as they think the shadow is just old scarring, from an infection for example. 
 

Fast forward to March 2020, another CT scan. Results come through saying all is well as everything still presents as scarring and a follow up scan in DEcember is all that was required.

December 2020 had the scan and now suddenly a PET scan is being ordered. Nobody has told us why and we are in full on panic mode, clearly.

Mother is in very good health and we can't understand why this is happening. Is it possible they're just ordering it to be double sure it's nothing sinister?