Precancerous tissue is when cells do not look normal. They could be benign or could evolve into cancer cells. Opacities can be caused by fluid, blood and/or puss. Pneumonia shows up as opacities. They can also be a precursor to a malignancy.
I've had them mentioned on almost all my scans, but they go away by the next one or two. They have yet to have solid nodules in them, which is more indicative of cancer.
I'm waiting to see what my next scan shows, as there were "nodular opacities" seen in one of my lower lobes, with the other LL in the other lung just showing an opacity. Hopefully they will both resolve as in the past.
Hope that helps!
Tony

Me to

Anthony, are you saying you had ground glass nodules with some opaqueness to them that could be fluid, blood, puss, pneumonia and they went away? That's what I'm hoping for.