Fig. 2.

Bronchiolitis obliterans organizing pneumonia. (A) Low power view shows young edematous connective tissue plugs within alveoli and an alveolar duct, with projection into the lumen of a respiratory bronchiole (proliferative bronchiolitis). (B) High power view shows young edematous connective tissue plug within an alveolus. Note the partial lining by epithelium (bottom) and the chronic inflammatory cells near the center of the plug. (Images courtesy of Dr. Victor Roggli, Department of Pathology, Duke University School of Medicine).