recticulonodular opacities with superimposed groundglass attentuation mean?

[Healthsavvy]

Hey everyone ,

I'm in my early 20's. I don't smoke or drink. However, I do have asthma. In the past I did have a lot of asthma attacks. Once I had a collapsed lung and on another occasion have had pneumonia when I was a kid. Anyway, I had to get an abdominal CT scan for some upper right abdominal pain I've been having. Everything came back normal except they found a "5mm lower left lobe nodule(5:11). Fine subplueral left lower lobe recticulonodular opacities with superimposed groundglass attentuation is probably post inflammatory?" That's what the report said.

I think I understand everything else that the nodule was found on my outside lower lobe and is 5mm, but what does "recticulonodular opacities with superimposed groundglass attenuation" part mean? Should I be concerned? I'm not a smoker and in my mid 20's. No one in my family has lung C.  I can admit I am a bit worried as my doctor told me it's a tiny solitary lung nodule over the left lower lobe. At 5 mm, this is extremely small and to follow up with another CT scan in 6-12months. Plus I'm concerned about being exposed to all that radiation. I've already had a chest X Ray earlier this year (March 2016) and it came back normal. The radiologist didn't see anything in my chest X Ray, but this pops up in my CT scan 2 months later. Is anyone with experience willing to help me break this down. I've even had a chest X Ray back in 2011 and nothing was found then either. Thanks!