Scars: In nflammation from any cause in so much area of the lung, inflammatory cells recruit the fibrocytes (scar cells). These cells lay down fibers to wall of the inflammations but because there is diffuse inflammation, they end up laying down fiber in the interstitial spaces in may areas. It thickens the areas in between the air sacs and the blood vessels. That is fibrosis, if limited area it's scar.
Answered 1/23/2014
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