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Classification of idiopathic interstitial pneumonias

Category	Clinical-radiologic-pathologic diagnoses	Associated radiologic and/or pathologic-morphologic patterns
Chronic fibrosing IP	Idiopathic pulmonary fibrosis	Usual interstitial pneumonia
Chronic fibrosing IP	Idiopathic nonspecific interstitial pneumonia	Nonspecific interstitial pneumonia
Smoking-related IP*	Respiratory bronchiolitis-interstitial lung disease	Respiratory bronchiolitis
Smoking-related IP*	Desquamative interstitial pneumonia	Desquamative interstitial pneumonia
Acute/subacute IP	Cryptogenic organizing pneumonia	Organizing pneumonia
Acute/subacute IP	Acute interstitial pneumonia	Diffuse alveolar damage

IP: interstitial pneumonia.

* Desquamative interstitial pneumonia can occasionally occur in nonsmokers.

Reprinted with permission of the American Thoracic Society. Copyright © 2020 American Thoracic Society. All rights reserved. From: Travis WD, Costabel U, Hansell DM, et al. An official American Thoracic Society/European Respiratory Society statement: Update of the international multidisciplinary classification of the idiopathic interstitial pneumonias. Am J Respir Crit Care Med 2013; 188:733. The American Journal of Respiratory and Critical Care Medicine is an official journal of the American Thoracic Society.

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