I'm concerned about a) I could be wrong, but i am under the impression that a biopsy will definitively tell you if it is small cell lung cancer, non small cell lung cancer, or squamous cell carcinoma. They are three different types of cancers. The may not be ale to tell you where the squamous cell came from, but in that case it would likely be mets.
I'm only saying this because they are all treated different ways. Or in the SCC case not really treated.

I would still push for a biopsy. I think or maybe doesn't wash for me. There is risk though with a biopsy as well though. Hugs. I wish I had answers -