Idiopathic pulmonary fibrosis is defined as a progressive interstitial lung disease characterized by inflammatory infiltration and increased extracellular matrix, collagen, and fibroblast deposition within the alveolar interstitium, typically in a basal, sub-pleural, and relatively symmetrical distribution. This structural change impairs oxygen diffusion across the alveolar-capillary membrane, reducing measured transfer factor, and the disease is classified among other causes of pulmonary fibrosis by distribution pattern (basal vs. upper lobe), symmetry, demographic association, and clinical course. The condition belongs to the domain of respiratory medicine, specifically the study of interstitial lung disease, and is distinguished from related fibrotic and granulomatous lung diseases by its distribution pattern, epidemiology, and idiopathic (unexplained) etiology.
Idiopathic pulmonary fibrosis is defined as a progressive interstitial lung disease characterized by inflammatory infiltration and increased extracellular matrix, collagen, and fibroblast deposition …