• Stephen Hobbs and David Lynch.
• Department of Radiology, University of Kentucky, HX-302 UKMC, 800 Rose Street, Lexington, KY 40536, USA. Electronic address: stephen.hobbs@uky.edu.
• Radiol. Clin. North Am. 2014 Jan 1; 52 (1): 105-20.

AbstractIdiopathic interstitial pneumonias (IIPs) are a group of disorders with distinct histologic and radiologic appearances and no identifiable cause. The IIPs comprise 8 currently recognized entities. Each of these entities demonstrates a prototypical imaging and histologic pattern, although in practice the imaging patterns may overlap, and some interstitial pneumonias are not classifiable. To be considered an IIP, the disease must be idiopathic; however, each pattern may be secondary to a recognizable cause, most notably collagen vascular disease, hypersensitivity pneumonitis, or drug reactions. The diagnosis of IIP requires the correlation of clinical, imaging, and pathologic features.Copyright © 2014 Elsevier Inc. All rights reserved.

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