1. Idiopathic Spontaneous Pneumothorax
Edward E. Tueller, M.D., Nancy R. Crise, John C. Belton, Ph.D., Richard F. McLaughlin, M.D., F.C.C.P. 
CHEST 
Volume 71, Issue 3, Pages (March 1977)
DOI: /chest
Copyright © 1977 The American College of Chest Physicians Terms and Conditions

2. Figure 1
Prominent basal lamina is present in this montage (arrows). Type 2 epithelial cells (E2) are proliferative in this area. Type 1 epithelial cells (EI) are also seen. Longitudinal and cross sections of collagen fibers are part of septal mass (CF) (original magnification × 5,500).
CHEST  , DOI: ( /chest )
Copyright © 1977 The American College of Chest Physicians Terms and Conditions

3. Figure 2
Dense elastic fibers (EF), as well as microfibrillar elastin (MF), contribute to septal mass. Bundles of collagen fibers (CF) are also seen. Epithelial lining appears to be intact (original magnification × 8,800).
CHEST  , DOI: ( /chest )
Copyright © 1977 The American College of Chest Physicians Terms and Conditions

4. Figure 3
Mast cell (MC) is present in interstitium. Collagen fibers are again numerous and are seen as longitudinal fibers and in cross section (original magnification × 8,800).
CHEST  , DOI: ( /chest )
Copyright © 1977 The American College of Chest Physicians Terms and Conditions