Abstract
The pulmonary interstitium is affected by a broad group of diseases. Of roughly 150 diseases, only a small subset is encountered regularly. Idiopathic interstitial pneumonias, sarcoidosis, Langerhans cell histiocytosis (LCH), hypersensitivity pneumonitis, and pneumoconiosis are among the most common. The consensus statement on interstitial pneumonias further classifies interstitial lung diseases into idiopathic interstitial pneumonias, diffuse parenchymal lung disease from known causes (eg, collagen vascular diseases), granulomatous disease (sarcoidosis), and a miscellaneous group that includes lymphangioleiomyomatosis (LAM) and LCH [1]. This article presents the imaging findings in sarcoidosis, silicosis, asbestosis, LAM, LCH, collagen vascular diseases, hypersensitivity pneumonitis, and pulmonary alveolar proteinosis (PAP) (Table 1). The idiopathic interstitial pneumonias are discussed in the second article on imaging of interstitial lung disease.
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