Conceptual
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Pathological Patterns of Interstitial Lung Disease in Pulmonology

Interstitial lung disease (ILD) theory in pulmonology holds that the specific histopathological pattern of infiltration into the alveolar interstitium determines the clinical and radiographic disease entity, rather than infiltration being a uniform process. Patterns range from predominantly inflammatory cellular infiltration to fibroblastic infiltration with excess extracellular matrix and collagen deposition (scarring), and distinct etiologies produce characteristic, differing infiltrate compositions such as granulomas or eosinophilic/lymphocytic infiltrates.