lung mets

Is it unusual to find lung mets without finding a primary tumour. I have no symptoms except for two bilateral small lung nodules. No symptoms of a primary elsewhere.  Im 42 and a smoker and very worried. I have a rescan in 4 months

[David Tinkelman, M.D.]

It is unusual but not unheard of.  Cigarette smoking places you at additional risk but, at age 42, nodules without any of the radiologic characteristics of cancerous nodules, in an asymptomatic person are likely to be benign.  Comparison with previous chest X-rays could be most helpful in distinguishing malignant from benign, if the nodules were present two years ago or more and are unchanged.  

Small nodules often do not lend themselves to  relatively non-invasive biopsy.  Apparently your physician(s) deem these nodules likely to be benign, and that should be weighted heavily, or they would proceed with additional non-invasive imaging studies.  

So you will have to deal with uncertainty for a few months but with the knowledge that the odds are in your favor.

Good luck