1. Volume 134, Issue 1, Pages 126-132 (July 2008)
Role of Surgical Lung Biopsy in Separating Chronic Hypersensitivity Pneumonia From Usual Interstitial Pneumonia/Idiopathic Pulmonary Fibrosis*: Analysis of 31 Biopsies From 15 Patients 
Syvain Trahan, MD, Viktor Hanak, MD, Jay H. Ryu, MD, Jeffrey L. Myers, MD 
CHEST 
Volume 134, Issue 1, Pages (July 2008)
DOI: /chest
Copyright © 2008 The American College of Chest Physicians Terms and Conditions

2. Figure 1
Low-magnification photomicrograph (original magnification × 40) showing chronic bronchiolitis in a patient with HP. There is a peribronchiolar infiltrate of predominantly lymphocytes in this field with minimal associated fibrosis.
CHEST  , DOI: ( /chest )
Copyright © 2008 The American College of Chest Physicians Terms and Conditions

3. Figure 2
Chronic bronchiolitis with granulomatous inflammation in a patient with HP. Top: Intermediate-magnification photomicrograph (original × 100) showing chronic bronchiolitis in which the peribronchiolar interstitium is expanded by an inflammatory infiltrate in which mononuclear cells predominate with occasional associated giant cells. Bottom: High-magnification photomicrograph (original × 400) showing an isolated multinucleated giant cell illustrated in the top panel. The cytoplasm contains a calcified Schaumann body, a nonspecific finding.
CHEST  , DOI: ( /chest )
Copyright © 2008 The American College of Chest Physicians Terms and Conditions

4. Figure 3
Low-magnification photomicrograph (original × 20) showing a cellular interstitial pneumonia in which the findings are accentuated around distal bronchioles (*).
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Copyright © 2008 The American College of Chest Physicians Terms and Conditions

5. Figure 4
High-magnification photomicrograph (original × 200) showing subepithelial fibroblast foci (arrows) in HP that are unassociated with honeycomb change, significant fibrosis, or organizing pneumonia.
CHEST  , DOI: ( /chest )
Copyright © 2008 The American College of Chest Physicians Terms and Conditions