Question @ lymph node

[Ceesun]

Hi all, Just had a recent pet scan which is rather confusing. It showed activity in the cyberknife area in lung. My onc said he is not sure if its residual disease or radiation changes. I do remember several monhs ago the radiologist said you may have tumor flare which is not cancer. Also there was some activity in lymph nodes between lungs....so my oncologist wants to wait a month and then do a ct of the chest. Any thoughts? Anyone with active lymph nodes, does that mean chemo? Radiation? Thanks, Cathy