Lung Nodule, Mets?

My mom is still in diagnostics. Liver tumor 8x9 cm, AFP 9700 and doc mentioned most likely HCC. CT and Pet showed lung nodule around 8 mm and mentioned possible metastasis.

Is there ever a world where something lights up on PET and it’s not cancer?

Her bone scan showed high turnover on the adjacent ribs to this nodule and all of it is fairly close to the liver. ☹️ We go back next week for next steps and I am just unsure what to expect.