The prognosis is good for full recovery, unless the problem has been ignored or untreated for many months (or years), in which case permanent lung scar tissue may form. (siriusdog.com)
You can also aspirate a bit and cause lung scarring. (floliving.com)
Researchers at UT Southwestern Medical Center have identified mutations in two genes that cause a fatal lung scarring disease known as familial pulmonary fibrosis. (sciencedaily.com)