Bob, I had the same thing and the pet scan came back negative, but my onc wasn't convinced and had me get a left lung resection. It came back negative. The nodule was in my left lung upper apex. The reason they preformed the surgery was because of SCC in my left supraclavicular lymph nodes and he suspected this to be the primary. I had radiation to that side and the thought afterward was this caused the nodule. Hoping thats the same for you.

5-02 SCC T1N1M0 Stage 3 Right Tonsil
6-02 Right Radical Neck Disection
9-03 Recurrent SCC Dx Stage 4 unknown prim
12-03 7 Chemo
12-03 36 Rad
5-04 Left Upper Lung Wedge Resection neg
7-04 Right Parotidectomy
9-04 Began IMRT
10-04 Ended IMRT