Hot Spot PET Scan

I'm a 27 year old recreational smoker (Maybe 5-10 packs a year.. so i'm essentially a non smoker). Anywho on November of last year during a routine check for bronchitis, a radiologist picked up an ovaloid mass on my Pleural Tissue of the lung. He said the size was of a tiny egg. Anywho, a pulmonologist gave me 2 cat scans, one in december and one on February and they both showed the mass but thankfully they showed no growth. So for the time being he determined this as a fibrosis of the lung as I have history of fibrosis (On my bones but never in an actual organ). Then two weeks ago I took a PET-SCan and the mass showed as a very bright hot spot. What could this be? Can a benign tumor show as a hotspot? Can this be pleural fibrosis?  please advise

[rcarver]

I work in x ray and I know a little bit about PET and Nuclear Med studies.  A hot spot is an increase in metabolic activity that attracts what ever radionuclide you had administered before the scan.  The entire body will attract it, but the areas of increased metabolic activity will have an increase attraction.....no, something that is benign will not show a hot spot, BUT, that does not mean it is some type of malignancy.  It can be any kind of infection and yes, pulmonary fibrosis will show a hot spot!