I do not think PET scan will give u answer whether it is benign or malignant .
U may check with your oncologist again.
I start with X ray and follow by CT scan .
Then, proceed for Lung Biosy and have the Pathologist to confirm whether it is benign or malignant , also to find out the type of lung cancer and the origin of the cancer cell .
After the confirmation , then only I been advise to take PET scan, where we will hv a better view of the overall situation and also whether it have spread to other part of the body , i.e. Brain ; Bone ; Colon ..
After my PET scan result , I proceed to hv MRI for my Brain and Colonscopy and Gastroscopy for further confirmation, as PET scan can not give clear confirmation of Brain / Stomach and Colon .
Anyway, my understanding from the few oncologist that I hv meet and also my reading , is that , we need tissue Biopsy to confirm whether it is cancerous or whether it is benign or malignant .
Wish my little sharing of information will assist you .
God bless .