Interstitial Pulmonary Fibrosis is the scarring and thickening of the lung tissues, a form of interstitial lung disease.

Interstitial lung disease refers to a group of diseases that are chronic, nonmalignant, and noninfectious. These diseases are characterized by infiltration of inflammatory cells into the walls of the alveoli (the air sacs of the lungs). The infiltration causes abnormal scarring in the connective tissue that supports the alveoli. If the disease progresses, scarring develops to...