Lung Diseases [Disease/Finding] Lung Diseases, Interstitial [Disease/Finding] Lung Diseases, Interstitial Diffuse Parenchymal Lung Diseases N0000003603 A diverse group of lung diseases that affect the lung parenchyma. They are characterized by an initial inflammation of PULMONARY ALVEOLI that extends to the interstitium and beyond leading to diffuse PULMONARY FIBROSIS. Interstitial lung diseases are classified by their etiology (known or unknown causes), and radiological-pathological features. Interstitial Lung Diseases Lung Diseases, Interstitial 233703007 C7384 M0026626 C0206062 D017563 1028101