linear fibrotic or atelectatic changes

I just received findings on my ct scan I originally went for kidney stones.  It stated that there was a subpleural nodule in the right lower lube and linear fibrotic or atelectatic changes within the medial aspects of the left middle lobe and lingula.  Today I had to go back to get a ct scan of my chest with contrast.  I originally went for suspected kidney stones, which they also found.I am awaiting answers.  Meanwhile,what does this mean?  Reading about ,it appears that my left lung is somehow deflated or infected?