<s>[INST] I got my PA X ray chest on 26.06.2014. In X ray report all six parameters are normal in last Dr. commented suspicious opacity in lower right lung field? nipple shadow. What does it means. I am over 50 yrs of age and in very good healthy condition & still do running for 1.5 km daily and walking for 5/6 km daily. I have never any health problem except infections due to influenza. Occasionally cough. Pl ease advise me. [/INST] Thanks for your query on Chat Doctor. In my opinion you should not worry about the report. As nipple can give rise to rounded soft tissue shadow in some cases. Better to go for lateral chest x-ray as in this x-ray if any shadow is there than it will appear inside the rib cage. And if it is nipple shadow than in lateral x-ray it will appear outside the rib cage. So by this method we can differentiate. Another way is doing CT Thorax. But I don't think anything worrisome. It is just a nipple shadow nothing else. </s>