Yes Bob your lungs could very easily have been damaged by the radiation. I have the same thing. My radiation Onc. kind of said "oh didn't we tell you about that?" The top of both my lungs are toasted. (sort of a light golden brown I think)

I believe you are OK (at least about this wink )

Go for the test and then relax.

Mark, 21 Year survivor, SCC right tonsil, 3 nodes positive, one with extra-capsular spread. I never asked what stage (would have scared me anyway) Right side tonsillectomy, radical neck dissection right side, maximum radiation to both sides, no chemo, no PEG, age 40 when diagnosed.