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IntroductionTop
Interstitial lung disease refers to a group of heterogeneous, noninfectious, and nonmalignant diseases that are characterized by diffuse inflammatory and/or fibrotic infiltration of the alveolar space or interstitial septum. Patients typically have a restrictive ventilatory defect, reduction in diffusion capacity of the lung for carbon monoxide (DLCO), and variety of alveolar filling and interstitial changes on high-resolution computed tomography of the chest.