Figure 1: Normal looking bronchiole with thin wall and mainly linear unicellular epithelium with ambiental antracotic pigment retention, HE x 40 (A); Chronic bronchiolitis: parietal lymphocytic infiltration and fusiform cells hyperplasia, with cylindrical cells hyperplasia, HE x 100 (B); Respiratory bronchiolitis: scarce lymphocytic parietal infiltration and luminal pigmented macrophages, HE x 40 (C); Hypersensitivity bronchiolitis: lymphocytic parietal infiltration also with commitment of arteriolar wall, HE x 200 (D).
Figures at a glance