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| - The idiopathic interstitial pneumonias are a distinct group of clinicopathologic entities. High-resolution computed tomography (HRCT) plays a critical role in the evaluation and management of patients. In the appropriate clinical setting, characteristic HRCT findings may be diagnostic, obviating the need for open lung biopsy. In more challenging or complicated cases, consensus among the clinician, radiologist, and pathologist may be required. This chapter describes and depicts the characteristic HRCT features of usual interstitial pneumonia, nonspecific interstitial pneumonia, cryptogenic organizing pneumonia, respiratory bronchiolitis, respiratory bronchiolitis associated interstitial lung disease, desquamative interstitial pneumonia, and lymphoid interstitial pneumonia.
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